Evil Alien Conquerors

Evil Alien Conquerors is a film directed by Chris Matheson who cowrote Bill amp Teds Excellent Adventure in 2003, and is a blend of sciencefiction and comedy. The film follows two aliens who are sent to Earth to destroy mankind, but when they arrive they are unable to complete their mission. The two aliens befriend a fast food employee who helps them.

The giant Croker then arrives to destroy the two inept conquerors and the rest of the Earths population, but he shrinks down to normal size during transportation. Delusional enough to still believe he is a giant, he attempts to wreak havoc on the town, obviously without success.

Source: Wikipedia