Ancient Egypt in the year 1290 B.C.
Thebes, City of the Living. Crown jewel of Pharaoh Seti the First. Home of Imhotep, Pharaoh's high priest, keeper of the dead.
Birthplace of Anck Su Namun, Pharaoh's mistress. No other man was allowed to touch her. But for their love, they were willing to risk life itself.
The two love one another more than life itself, but as long as Seti lives, they may never be together, leaving them with the plan of assassinating the pharaoh.
As a precaution to ensure that Anck-Su-Namun stayed within Seti's rule, she is painted in several coats of golden body paint, which ensures that no other man might touch her, though the precaution is thrown out when Anck-Su-Namun comes close to Imhotep as the two are in Anck-Su-Namun's residence and the they share a kiss, which ends in Imhotep smearing the paint on Anck-Su-Namun's left arm.
At that moment, Seti, who has just come to Anck-Su-Namun's residence, is surprised to see Imhotep's priests at the residence, but is utterly infuriated when he sees Anck-Su-Namun with the paint on her arm smeared and Seti asks which man dared to touch her.
Imhotep comes from behind the pharaoh and is about to assassinate Seti with a dagger, but ceases as Anck-Su-Namun stabs Seti with another dagger, her lover joining in until Seti is killed. The Medjai, the pharaoh's elite guard, storm the residence, seeking whoever had committed the crime.
The Medjai were too late to catch one of the real culprits as Imhotep leaves the scene at the request of Anck-Su-Namun, who states that only he could bring her back to life were something to happen. Upon discovering Seti's corpse and Anck-Su-Namun with a dagger, the guards watch as Anck-Su-Namun, feigning treachery, stabs herself in the stomach with the dagger used to murder Seti.
Soon after, Imhotep and his priests unearth her body and race into the deserts to seek Hamunaptra, the City of the Dead, where the wealth of kings and the resting place for pharaohs lays.
Here Imhotep seeks the black Book of the Dead so as to revive his love, and began to perform the spell that would bring her to life. But before the ritual can be completed, the Medjai, who had followed the priests as they headed to Hamanaptra, storm the chamber where the ritual is being performed.
To commit an act such as bringing one back from the dead is blasphemy of the worst caliber, and so the priests are all condemned to death by mummification while they were alive. Imhotep, having led them into their sin, is condemned to endure the Hom-Dai, a curse so powerful that it had never before been performed.
The priest's tongue is ritualistically cut out, and he is bound tight in wrappings, placed in a sarcophagus which is filled with flesh-eating scarabs.
As the scarabs eat Imhotep alive, the lid is placed over the sarcophagus, sealed with a key resembling a puzzle-box.
The Medjai and their descendants vow from that time on to watch over the city's ruins so that none might find either Imhotep or the means to bring him back to life.
In 1923 A.D, centuries after the pharaohs of Egypt had fallen, the Medjai still exist, becoming a furtive secret society over the years with the same goal as they did centuries ago: to ensure that none find the ruins of Hamanaptra.
One group of Medjai led by Ardeth Bay stand vigil over Hamunaptra, witnessing a garrison of the US troops, British troops and French Foreign Legion that have found the ruins, setting up their post within the crumbling walls. The Legionnaires in the garrison believed so much that Hamunaptra existed that they trekked across Libya into Egypt, and encountering a great army of Tuareg warriors at the site.
Rick O'Connell, an American serving as corporal in the Legion, has been promoted once the leader of the garrison, Colonel Guizot, deserts the ruins on horseback, leaving his men on their own.
O'Connell leads his fellow Legionnaires into successfully bringing down many Tuaregs, but as the battle wages on, the Tuaregs kill off more and more Legionnaires including 10 US troops and 12 British troops until only O'Connell himself and Beni survive. Beni runs away. O'Connell blasts away many Tuaregs with his pistols, but finds himself outnumbered once his bullets run out.
The Tuaregs chase him into a corner, but can't fire, as their horses are frightened off by something within the sand; with this, the Tuaregs leave Hamunaptra, leaving O'Connell alone to face whatever is in the sand, until the movements in the sand drive him off as well. Running off into the desert, O'Connell notices a group of men on horseback watching him in the distance, Medjai, who decide not to kill him, as the desert would do that.
Three years after the battle at Hamunaptra, the Cairo Museum of Antiquities.
A young aspiring Egyptologist by the name of Evelyn Carnahan accidentally causes a domino effect of falling bookshelves, destroying the room.
Museum curator, Dr. Terence Bey, enters the room and is shocked to see the catastrophe she has caused.
Evelyn is given an artifact by her brother Jonathan Carnahan. The object is similar to a puzzle-box and clicks open to reveal eight different-shaped edges and a map made of papyrus.
Evelyn and her brother show the item to Dr. Bey, who dismisses the box and the map inside as nothing more than fakes. Upon examining the box, however, the three scholars learn that the box was actually the key to Hamunaptra, and that the map within must be real.
The curator idly holds the map for a moment and inadvertently brushes the paper against a small candle on his desk. The map half-destroyed, the curator states that it was for the best, as men had sought after Hamunaptra for many years, and none had ever found it, with most never returning.
Evelyn, however, is not as quick to defeat, and has her brother take her to the previous owner of the map.
Former French Foreign Legion corporal named Rick O'Connell who had been pick-pocketed by Jonathan for the box, with the former officer being incarcerated in the Cairo prison. Evelyn meets the man with interest, as he had been to the City of the Dead and came back alive.
Although O'Connell is brash and impudent, he agrees to tell Evelyn how to reach the ruins, provided he is set free, sealing his words with a kiss.
Rick is about to be hanged as Evelyn and the warden of the prison, Gad Hassan, look on. Evelyn barters with the warden for Rick's life, but negotiations fail and Hassan gives the order to continue the hanging. Rick is hanging from the noose. However his neck did not break and now strangling to death. Evelyn reveals Rick knows the location to Hamunaptra and they finally strike a deal. O'Connell is set free to lead the expedition with the Carnahans to find the City of the Dead.
Once at Giza Port, O'Connell meets with the Carnahan siblings and boards a riverboat with them that would take them all to the next point in their travels; this expedition joined by Warden Hassan, who demands to come along so as to protect his investment. Once on the riverboat, O'Connell and his group meet other men seeking Hamunaptra: three American treasure hunters and their professorial consultant. The Americans make a wager with O'Connell that they would reach the City of the Dead first, which O'Connell sportingly accepts.
Later that night, O'Connell tells Evelyn of his experience in the ruins, and that he comes armed because something resides in those ruins: evil. Evelyn, however, does not believe in curses and dismisses the notion of evil lying beneath the sands, hoping instead to find an ancient artifact known as the Book of Amun-Ra; O'Connell insisted that it is wise to be armed in case. Evelyn then asks him why he had kissed her back at the prison, with O'Connell responding that he was about to be hanged and that it seemed right at the time.
Evelyn leaves in a huff, leaving O'Connell alone until he meets up with Beni, whose actions of cowering in the ruins had almost gotten O'Connell killed. Beni reveals that he is leading the Americans to Hamunaptra, but asks why O'Connell, who had never believed in Hamunaptra, is returning. When O'Connell reveals that it is because Evelyn had saved his life, Beni sarcastically jokes about it: O'Connell not appreciating the humour and subsequently tossing Beni overboard.
That night, a number of Medjai come aboard looking for the puzzle box and the map that Evelyn owns. One Medjai has Evelyn at the point of a blade, which O'Connell sees and begins fighting against the assailants. O'Connell quickly begins shooting off many of the men, joined by the three Americans, but the Medjai have caused too much damage to the riverboat to remain aboard, compelling O'Connell and all others aboard to jump ship and swim to shore.
The passengers all reach the riverbanks safely, but Beni and his employers succeed in obtaining the horses and camels from the boat, leaving O'Connell and his fellows to purchase their own rides at a Bedouin trading post the next morning.
The four riders travel through the desert to find Hamunaptra, until they reach a point in the Sahara where they encounter Beni and his employers, now with three dozen diggers in their midst.
Both groups pause for a moment as the sun rises, then resume their journey, each group racing against the other to reach the city first.
The group consisting of Evelyn, O'Connell, Jonathan, and the Warden win the race, reaching the ruins before the others do.
Once camp is being set up, the Americans take the best areas to search for treasures to themselves.
The smaller group searches for openings to the chambers below.
Making their way to the underground chambers, the group headed by O'Connell searches through the tunnels for any areas in which to dig and find treasures.
Reaching the base of the statue of Anubis, the four treasure hunters begin to hear strange sounds coming from around the statue.
Guns out in the open, they turn around to face the source of the sounds, coming instead face-to-face with the rival group, also armed.
With both groups meeting in the same area, the argument over the right to dig at the statue base begins, ending with the Americans and their diggers winning the statue base; as Evelyn notices quietly that there is another chamber below, she surrenders the chamber to the larger group. Beginning to dig and pry at the stone ceilings, O'Connell, Evelyn and Jonathan believe that they can find the secret compartment that houses the Book of Amun-Ra, and take it while the Americans are all distracted.
As they are working on the ceilings, the Warden separates himself from the rest of the group, making his way through a passageway where he finds an elaborate mural on the wall. On the mural are several shiny stones, which the Warden identifies as precious and begins to pry off the walls with a knife. Meanwhile, in the chamber above, one of the Americans, a man named Henderson is about to pry open the compartment at the statue base of Anubis in the hopes of finding treasure.
He is stopped by the Egyptologist Dr. Allen Chamberlain, who informs him that that the Pharaoh was no fool to make his valuables so easily obtained, and so advises the treasure seekers to have the diggers open the compartment instead. Three diggers step forward and began to pry at the compartment as the Egyptologist urges them on, pushing harder and harder until a torrent of salt acid shoots out at the three diggers, killing them.
After some time has passed, Jonathan manages, by accident, to find a compartment where a sarcophagus is stored, releasing a large stone coffin. While the two others present stand in awe at this find, the Warden is still prying stones off the walls elsewhere, until one stone, having missed his bag and fallen onto the floor, cracks open, revealing a living scarab beetle, that tears open the Warden's shoe and eats its way up the Warden's skin to his head.
The other three examine the sarcophagus that has fallen from the ceiling, and deduce that the puzzle box that had been the cause of the Medjai attack on the riverboat is the key to opening the sarcophagus.
Putting the key's ends in place, the three treasure seekers understand how to open the sarcophagus, but the moment is cut short when screaming erupts from the tunnels outside.
Guns out again, O'Connell and the Carnahans rush out to find the Warden screaming and clawing at his head, running almost as if mad; pushing the others out of the way, the Warden runs shrieking into a stone wall, killing himself. That night, the treasure seekers' campsites are invaded by a group of Medjai, who come on horseback and kill off a number of diggers.
The treasure seekers from both expeditions begin firing their pistols at the warriors, taking down some of them, until O'Connell is confronted by the Medjai leader, Ardeth Bay, who disarms O'Connell of his gun before O'Connell rushes backward and lights a stick of dynamite, holding it out to show the Medjai chieftain that he will not give in so easily. The Medjai chieftain decides to call off his warriors, telling the expeditionaries they will shed no more blood, but they must leave this place or die.
Giving the expeditions one day to leave, the Medjai leave the campsite, which causes some puzzlement among all the treasure seekers as to why a group of nomads would attack for no apparent reason. Making the decision to stay and to combine forces at night, the expeditionaries move their tents to one shared area.
Later, the relationship between Rick O'Connell and Evelyn Carnahan begins to grow, as Evelyn, now loosened somewhat, tells O'Connell of her family, and of her father, who was a famous explorer. As the librarian inches closer to the adventurer so as to kiss him, she passes out completely in a drunken state, having had some of the late Warden's whiskey.
The next morning, the treasure seekers of both expeditions return to the tunnels and chambers below: the Americans and their diggers returning to the compartment at the base of the statue, where they extract a wooden chest. As the three Americans step forward to pry the chest open, the Egyptologist informs them that the chest has a curse placed upon it. The Americans do not believe in the curse, although the Egyptologist warned them all that the curse would strike them all were they to open the chest.
Regardless of the given consequences, the Americans proceed to force open the chest, as Beni and their diggers run off in fear. The smaller group finds another item: a mummy that was preserved inside of the sarcophagus that they had found earlier. The mummy had been buried alive and had managed to claw a message into the wall of his sarcophagus: "Death is only the beginning".
That night, as both expeditions talk about their findings over a campfire, Evelyn noticed that the Egyptologist has found the Book of the Dead and is attempting to pry it open with his hands, to no avail: without the key, Evelyn states, the Book remains locked.
Later, as all in the campsite are asleep, Evelyn steals the Book of the Dead from the Egyptologist's grip as he sleeps, and uses the key to open the locks. Evelyn then opens the Book and begins to read the words aloud, not knowing that the mummy found below in the chambers is awakening. Dr. Allen Chamberlain awakes screaming at Evelyn to not read from the book.
A plague of locusts flies out over the horizon, engulfing the camp and its residents entirely, as most of the expeditionaries run into the underground passageways.
The expeditions are separated: the three Americans run down the corridors with a number of their diggers, but Burns, one of the three Americans, trips and falls, losing his spectacles, which are crushed by Beni as he attempts to reach the others. Unable to see where he is, Burns stumbles about the corridors blindly, seeing a fuzzy-looking figure at the end of the corridor, but unable to see who it is. The figure sneaks up from behind him and tears out Burns' eyes and tongue as he screams in terror.
The others throughout the ruins are besieged with the peril of running from man-eating scarab swarms.
As O'Connell, Evelyn and Jonathan run through one corridor, Evelyn is separated from the others and falls through a trapdoor in the wall.
Evelyn finds herself in a dark chamber where she sees Burns, his back turned to her. As she leans forward to speak to him, Burns turns around to reveal that his eyes and tongue have been torn out. Evelyn is then caught by the culprit: the mummy that she and her fellows had found before had stands behind her with Burns' eyes and tongue in its skull: Imhotep.
The mummy walks towards her, believing her to be Anck-Su-Namun, and roars in anger when approached by O'Connell, Jonathan and the two Americans.
O'Connell roars back in mock gesture and blasts Imhotep in two with his elephant gun, allowing the expeditionaries to escape. The expeditionaries are found and surrounded by armed Medjai who have already taken Dr. Chamberlain hostage. Their leader, Ardeth Bay, explains that because they did not leave, they have brought forth an ancient suppressed evil that has been feared by the Medjai for over three thousand years.
Ardeth Bay informs O'Connell, who had shot the mummy, that mortal weapons cannot kill the creature as he is not of the mortal world. Two Medjai warriors then bring Burns forward, who had been saved by the Medjai and was lucky to survive before the creature could finish his work. Commanding them all to leave, Ardeth declared that his fellow warriors will go on the hunt and try to find the means to kill the mummy, for the creature is the bringer of death, never resting until his curse overtakes the whole of the Earth.
Meanwhile, Beni, who has been separated from the rest of the group, wanders the catacombs and finds himself face to face with the mummy.
Imhotep, not yet regenerated, walks toward Beni, who tries to plead for his life with religious icons from different beliefs, he is backed against a wall. Beni speaks incantations in three languages, at last speaking one in Hebrew. The Star of David, the Hebrew symbol, appeals to Imhotep. Imhotep holds out a handful of gold to Beni.
The surviving expeditionaries and diggers return to Cairo after their experiences in the desert and reside in Fort Brydon, the British military outpost within Cairo. In Fort Brydon, Evelyn begins packing her trunk with clothes so as to return to Hamunaptra, but O'Connell tries to persuade her to do otherwise. Unable to convince Evelyn, O'Connell leaves her quarters to have a drink in a bar, where he finds Winston Havelock, an aging British aeroplane pilot that rues not having died in battle, who drunkenly laments his predicament aloud before leaving.
O'Connell then meets up with Jonathan, Daniels and Henderson, the latter two planning to leave Cairo for Alexandria with Burns, but the boat will not leave until the next morning. Burns, who remains in his quarters, meets with the mummy himself, who Burns is informed is a prince seeking to buy Burns' canopic jar. Imhotep wears a mask and long dark robes to conceal his identity, with Beni as a mediator. Imhotep is there to consume the rest of Burns.
Henderson and Daniels toast O'Connell and Jonathan with a drink, but promptly spit it out, along with the other bar patrons once they see that it is blood, as is the water coming from a fountain in the bar. O'Connell hastily sprints out to meet Evelyn, informing her that they have problems.
At that moment, thunder crashes and hail and fireballs rain from the sky, destroying buildings and incinerating people. During this, O'Connell finds Beni and attempts to force the Hungarian to tell where he's been, but a loud roar from upstairs of the building that Beni emerged from distracts them all, and O'Connell and Evelyn rush in to find Burns a desiccated corpse in a bathrobe and blindfold.
At the end of the room, in front of the fireplace stands Imhotep, already regenerating. O'Connell begins firing at the corpse but the shots do nothing, nor do those of Jonathan, Henderson and Daniels, who all open fire as well. The mummy throws O'Connell clear across the room, knocking down the other three men before proceeding to lean forward to Evelyn, thanking her for bringing him back from the Underworld.
Imhotep attempts to kiss Evelyn but her cat Cleo makes her presence known by standing on the keys of a piano in the room. Terrified of the cat, Imhotep groans aghast and departs the room in the form of a sandstorm out the window.
Seeking answers, the survivors (O'Connell, Evelyn, Jonathan, Daniels and Henderson) all head to the Cairo Museum, seeking the help of Dr. Bey. Evelyn sees the chieftain of the Medjai himself, Ardeth Bay. The men draw their guns and point them at Ardeth. Bey reveals they are part of an ancient secret society. For over three thousand years they have guarded the City of the Dead. They are sworn at manhood to do any and all in our power to stop the High Priest Imhotep from being reborn into this world.
Dr. Bey explains that Imhotep, in his undead form, fears cats because they are the guardians of the Underworld and will fear them until he regenerates, at which point he will fear nothing, Daniels and Henderson being especially fearful of how the mummy regenerates.
Evelyn notes that while the group was in Hamunaptra, the mummy called her "Anck-Su-Namun" and while they were in Burns' quarters, he attempted to kiss her: Dr. Bey notes that Imhotep was cursed for his love of Anck-Su-Namun and that after three thousand years he is still in love with her, intending to bring her back from the dead and use Evelyn as the sacrificial victim needed.
As Jonathan remarks that it's bad luck, Dr. Bey states that it might give them the time needed to kill Imhotep, but Ardeth Bay looks up through the museum skylight to see that the sun is being blocked out, a sign that the mummy's powers are growing.
At the residence where the survivors are staying, Evelyn asks who was present when the chest was opened: Burns, Henderson, Daniels and the Egyptologist, Dr. Chamberlain; Beni ran in fear before they could open the chest.
Evelyn notes that they must rescue the Egyptologist and bring him back to Fort Brydon before the mummy can reach him; O'Connell agrees, ordering Evelyn to stay, and Henderson, Daniels and Jonathan to accompany him, to which all the others protest loudly against. Evelyn insists on coming along but O'Connell lifts her up and locks her in her room.
Chamberlain runs through the streets of Cairo with a canopic jar and the Book of the Dead, unnerved at the sudden darkness and unknowing that Imhotep, clad in ragged black robes and a hood, is hunting him. Beni, taking advantage of the Egyptologist's disappearance, proceeds to ransack his office, looking for the Book of the Dead when O'Connell and Jonathan find him. Beni attempts to escape but O'Connell throws a chair at him, impeding him from jumping out the window.
O'Connell demands to know what Beni is doing with Imhotep and what he gets out of it, to which Beni responds that as long as he serves Imhotep, he is immune from Imhotep's powers. Demanding to know what Beni is after, O'Connell lifts the Hungarian up by his shirt towards the ceiling fan, at which point Beni reveals all: the Book of the Dead is what Imhotep wants and he told Beni that it would be worth its weight in gold.
Beni goes on to say that Imhotep plans to use it to bring his "dead girlfriend" back to life, but that other than the Book and Evelyn, he wants nothing. About to say more, Beni is cut off when a loud screaming sounds outside, and Beni takes advantage of the three's distraction by kneeing O'Connell in the groin and jumping out the window, escaping. As they look outside the window at the city streets, O'Connell and Jonathan find the desiccated corpse of Dr. Chamberlain, with Imhotep standing over him, surrounded by frightened Arab bystanders.
Taking the jewelled canopic jar from Chamberlain's withered grip, Imhotep turns around to face the window, revealing a face slightly more regenerated before dislocating his jaw to let loose a massive swarm of flies, which swarm all around the locals as Imhotep strides through them.
Back at Fort Brydon, Daniels' unease grows with having to guard the door and leaves to get a drink. Henderson proceeds to watch the door alone when the window opens with a blast of wind and sand, at which point Henderson is lifted up in the sandy cloud and sucked devoid of organs. The sand settles and Imhotep, almost entirely regenerated, strides toward the door, passing the corpse of Henderson.
Imhotep enters the locked room by taking the form of sand and slipping through the keyhole, coming up on the other side to find Evelyn sleeping. Imhotep softly utters "Anck-Su-Namun", shuts his eyes and kisses her, indifferent to her waking up screaming as his face starts to decay.
At that moment, O'Connell and Jonathan burst in, O'Connell yelling at Imhotep to get away from Evelyn; Imhotep hisses a retort in ancient Egyptian. Rick holds up Cleo, Evelyn's cat, brandishing her at Imhotep, who gasps as the cat hisses. Imhotep shrieks in fear and flees in a dust storm.
O'Connell, Evelyn, Jonathan and Daniels are the only survivors and head to the museum to seek help from Dr. Bey and Ardeth Bay in examining the artifacts on display for clues as to the location of the Book of Amun-Ra, which can kill Imhotep, when they hear chanting outside and look through the window to see the people of Cairo, plagued with boils and sores.
They march in a massive crowd chanting Imhotep's name; they have become his slaves.
The townspeople then proceed to try to break through the museum doors as Evelyn and Dr. Bey read from a slab covered in hieroglyphs, and Evelyn concludes that the Book of Amun-Ra is back at Hamunaptra inside the statue of Horus (god). Jonathan runs out to start the car for an escape and is almost caught by the enslaved townspeople but throws them off the trail by acting zombified himself, and he runs to the car, bringing it to the museum entrance where the five others escape the museum.
Beni, however, catches them and alerts Imhotep to their presence: the mummy roars, and his minions pursue the car through the streets of Cairo, when a large crowd of them blocks the road. The car drives through them, and is covered quickly in minions who attempt to wrest the passengers out of the car, succeeding in throwing Daniels out, who is backed up into a corner and fires his guns at the enslaved villagers, quickly running out of bullets as Imhotep himself strides in.
Daniels, in fear for his life, presents the canopic jar and Imhotep roars furiously, proceeding to kill Daniels and take his organs. The remaining five drive through Cairo when the car crashes and the enslaved villagers swarm all around them, blocking the exits: Imhotep then walks coolly through them, fully regenerated and asking Evelyn to come with him, in exchange for sparing her friends' lives.
Reluctantly, Evelyn steps forward as O'Connell tries to stop her but Evelyn states that Imhotep still needs to take her back to Hamunaptra to complete the ritual. Leaving the scene, Imhotep orders his slaves to kill the survivors as Beni pilfers the puzzle box from Jonathan. The survivors escape the slaves by diving down a sewer, with the exception of Dr. Bey, who stays behind to fight the minions at the cost of his life, allowing the others to escape.
The next day, O'Connell, Jonathan and Ardeth Bay reach the Royal Air Force Airfield on the outskirts of Erfoud, where they find Winston Havelock, who asks about the mission.
Winston accepts happily. Offering his biplane, he has room for a pilot and gunner only.
Jonathan and Ardeth are tied to the plane's wings and the pursuit begins. Imhotep has reached the desert with Evelyn and Beni in tow when he hears engines roaring in the sky and Evelyn looks hopefully up, knowing that O'Connell has returned for her. Imhotep, however, fights back by summoning all the sands of the desert and unleashing a vast sandstorm that pursues the plane throughout the desert. The sandstorm takes on a smiling human face, which O'Connell fires at with the machine gun in the plane.
The plane is soon engulfed in the desert sands as Imhotep attempts to kill O'Connell and his friends by causing the sandstorm to literally swallow the plane; Evelyn takes action and kisses Imhotep fully on the lips, ending his grip on the sandstorm but the plane crashes, to its pilot's delight at earning a hero's death, from the engines overheating.
Thinking the plane's passengers dead, Imhotep calmly stride over to the ruins of Hamunaptra with Beni and a distraught Evelyn.
The plane's passengers, however, escape the wreckage alive, save for Winston, whose neck was broken in the sandstorm.
The plane then begins to sink into the desert sands, taking Winston's body with it, as O'Connell, Jonathan and Ardeth Bay pay Winston a silent salute at his help and proceed to the ruins.
A bunch of mummies start coming out of the ground . . . Imhotep's priests. Rick starts shooting. Evelyn is rescued after an intense battle with Imhotep's mummified priests, and she reads from the Book of Amun-Ra.
Imhotep becomes mortal again and Rick stabs him, forcing him into the River of Death. Rapidly decaying, Imhotep leaves the world of the living, vowing revenge with the same words he carved into his sarcophagus, Death is only the beginning.
While looting treasure from the pyramid, Beni accidentally sets off an ancient booby trap and is trapped by a swarm of flesh-eating scarabs as Hamunaptra collapses into the sand. The heroes escape, although they lose the Book of Amun-Ra in the process. Rick and Evelyn kiss and they ride off into the sunset.