A gig? They all say, looking at each other and getting out of the van and meeting up with Laliari, whose image remains on Earth as Nesmith thought they might change their minds. Laliari orders up pods for all of them and in short order the acting crew of Galaxy Quest realize they are now on the real deal in outer space and that's a little more reality than they were planning on.
We see the aliens in their real form for the first time and they are a type of pastel octopus or squid who use a device to take human shape and speech. Fred Kwan is the only one of the actors who is so out of it he's here now, probably due to too much Hollywood living, he is the only one blindly up for the adventure. Down deep inside he's as crazy as Nesmith only it didn't take him a first time to be that crazy.
Gwen and Dane are the only sane ones who think it's totally insane to do this gig! Tommy's trying to deal with it all. They get a tour of the facility, go aboard the ship where they get more of a tour and meet the crew and other "termites" as Nesmith calls them. They take their places on the bridge and take the ship out into space to meet with Sarris.
We learn that Mathesar and his people think Earth TV is serious documentary news and that shows like Galaxy Quest and Gilligan's Island are reality TV or new reports like the war in Iraq. Gwen and Dane take issue with Nesmith who is going along with this blindly because they think he's on an ego trip and maybe he is! He sure likes inspecting the troops.
The audience eventually discovers that Sarris had captured and tortured the last commander who told Sarris all about things on Galagy Quest, including the coveted Omega 13 device, which Sarris wants to own at all costs. The "termites" don't know what the Omega 13 does, but badly-constructed, the device will disintegrate every matter atom in the universe. However, nobody knows where it is.
This sends the actors packing, except for Nesmith who still thinks he can handle Sarris. Well, he has to as Sarris has arrived and they must confront him. Sarris overhears Nesmith talking about his plans of attacking him with all their weapons because Gwen didn't follow Nesmith's order to cut the microphone, so he shoots first. The engine dies off, but synergy leads the starship to a landmine abandoned since an old war. When they leave the place, they manage to stop the starship.
The crew tries to explain that the Galaxy's adventures are a fiction, not historical documents, but the concept doesn't entirely resonate with the aliens: they have just started to understand the concept of "lie" and "deceit" as Sarris promises something and then does another thing. A new sphere of the energy source called beridium is found in a planet nearby, so they have to go and pick them. Arriving to the planet where the sphere is, it looks like the rocky Nevada desert, and they can breathe naturally.
A kind of home appears. Some little monkeys are working on the mines. Guy is worried that he's the extra - the sixth crewmember- who hasn't got even a simple surname. One of the cute little monkeys is weak and sick, so the rest of the mining monkeys eat it alive. The crew try to steal one of the beridium spheres by rolling it away. Hundreds of monkeys appear. The starship leaves with the sphere but without Nesmith, as Lazarus complains that Nesmith needs to be always the main protagonist.
A large animal is about to eat Nesmith. The animal is tele-transported, and it dies painfully, becoming a ball of goo. The monkeys keep on shouting "Gorignak ", which is a monster made of rocks. Finally, Nesmith is tele-transported to the ship. Back at the spaceship, Sarris has invaded the ship. Apart from that, Nesmith is told that there are no more people on planet Earth.
Nesmith says that there is no use in torturing Mathesar, as he doesn't know what the Omega 13 device really is. He and Gwen show Sarris the "historical documents", who immediately understands the situation. He forces Nesmith to explain to Mathesar in simple words that a child can understand that they are not heroes, but only actors. Sarris tells his thugs that they are going to make the starship explode with everybody inside.
However, Nesmith and Lazarus pretend to fight, and they use the distraction to throw their guardians to the space void. Gwen reminds Nesmith that neither of them can activate a neutron engine. But Nesmith knows somebody who will know how to operate it. Brandon (Justin Long) is a nerdy geek who asked a lot of technical questions during one of the gigs. Gwen and Nesmith follow Brandon and his friend Kyle (Jeremy Howard)'s instructions.
When asked what the Omega 13 device may do, Brandon says they think that it may allow to go back in time in 13 seconds. Hollister (Jonathan Feyer) discovers the rhythm of the smashing iron poles. Lazarus and Quellek (Patrick Breen) open the door to bring oxygen to the Thermians. Laliari and Fred kiss like crazy. Finally, Nesmith reaches the blue button which will stop the explosion.
Brandon can't help Nesmith and give him an alternate solution when the blue button doesn't stop the countdown because his mother, Katelyn (Kaitlin Cullum) forces him to take the rubbish out. Nesmith and Gwen hug, listening to the last seconds of the countdown. However, in the series, the countdown always used to stop a second before, and that's what happens.
Nesmith orders Tommy to drive the spaceship into the minefield. There, the magnetism of the ship attracts many mines. Nesmith's ship faces Sarris' ship, and goes down in the last second. The mines destroy Sarris' ship. However, after going through a black hole, Tommy mentions an increase of energy from Sarris' ship. Sarris has entered Nesmith's ship. Pretending to be Fred, he wounds Nesmith and kills the rest of the crew.
Nesmith shouts to Mathesar to turn on the Omega 13 device, so he arrives back in time - only 13 seconds, but time enough to hit Fred as soon as he enters the control room. All the Thermians leave the spaceship, except for Laliari. They arrive at the convention they were supposed to attend - where thousands of geek fans are already disappointed they are not there - crash-landing with their spaceship thanks to Brandon and his friends.
In the convention, each cast member leaves the ship half-suffocated and dizzy. Sarris also wakes up, but he is killed in a second, something which drives the fans wild. CUE to the new season of Galaxy Quest - the cast includes a character called Laliari, performed by Jane Doe and who kisses Fred, and a new security lieutenant, interpreted by the extra actor Guy Fleegman.