Bud and Doyle are two losers who are doing nothing with their lives. Both of their girlfriends are actively involved in saving the environment, but the two friends could care less about saving the Earth. One day, when a group of scientists begin a mission to live inside a "Bio-Dome" for a year without outside contact, Bud and Doyle mistakingly become part of the project themselves. The two must then learn how to protect the Earth and help the scientists complete their mission.

Actors Jack Black and Kyle Gass perform together as the musical group Tenacious D in real life.

Doyle:
I don't want to have to eat you!


Bud:
I don't you to eat me either.

Continuity: When Doyle bends down to kiss his girlfriend at the glass window, his sunglasses are in the collar of his shirt. When he rises the sunglasses are gone, and reappear in the next scene.

Written by Francis Garcia and Jeramy Nugent
Performed by Fourth Grade Nothing
Courtesy of Bulletproof Recording Company, Inc.