Evil Alien Conquerors

Dimwits My-ik (Diedrich Bader) and Du-ug (Chris Parnell) are hostile aliens from the planet Kabijj. When they're sent to Earth on a sacred mission to behead everyone, their swords shrink and render them weaponless. Luckily, they befriend Kenny (Michael Weston), who helps them find their way around. But here's the catch: If the slayers don't complete their mission in two and a half days, their leader will send a murderous giant to do the job.