The setting is on the Kanamits ship were they plan to eat all of the humans that they tricked to bored the ship. Mr. Chambers has just scarfed down his meal after becoming to hungry to not.
Mr.Chambers is put in another prison cell because more humans boareded the ship. Mr. Chamber gets mad because the other person named Mike who he shares a cell with, thinks the Kanamits is just playing with them and just making the whole eating humans thing up and they will eventually make it to there planet were everything will be fine.
While Mike is sleeping Mr. Chambers finds a way to escape through a air vent, he pries it open with a fork that they gave out with dinner.
Mr. Chambers ends up in the control room after crawling in the air vents and and figures out that the ship is all controlled by a computer and Mr. Chamber figured out how to change the destination from the Kanamits planet back to Earth.
After Mr. Chambers changes the destination back to Earth the Kanamits find him and return him to his prison cell.
Mr. Chambers waits an hour or so and goes back through the air vents and remembers seeing a button that unlocks all of the prison cell doors. When Mr. Chambers gets to the control room he found out the Kanamits never found out the destination switch and were actually arriving to Earth soon, when they were close he pressed the button and opens the prison doors. When the Kanamits saw what was happening the humans out numbered the Kanamits and figured out a way to open the big ships door and escape safely.