Main •
Jack Black as Jack Austin, a former
astronaut. He was exposed to inappropriate levels of
solar energy, giving him
superintelligence. He appears to lose this intelligence at night, requiring only Earth-normal levels of daylight to reactivate it. His catchphrases are "I know EVERYTHING!" and "Knowledge is power... for real." •
Owen Wilson as Heat Vision, a talking
motorcycle. He was created when Jack's unemployed roommate Doug was shot by an experimental ray gun, causing him to merge with his motorcycle. He is capable of speech and can fight by ramming into opponents. He is unable to use doorknobs and is unable to right himself if pushed over. •
Ron Silver as himself, the main villain. He works for
NASA, and will stop at nothing to capture or kill Jack Austin, but he also dabbles in acting, perhaps as a diversion, perhaps as a cover. He appears to be invulnerable, shrugging off the threat of being shot and later displaying great annoyance but no injury or pain when he is actually shot.
Guest •
Christine Taylor as The Sheriff •
Vincent Schiavelli as Frank, a cook who becomes possessed by an alien broadcast and thereafter calls himself Paragon •
O-Lan Jones as Patrice •
Sy Richardson as Doctor ==Legacy==