President Scroob wants to get rid of his political rival, so he and Dark Helmet travel back to 1984 Earth so they can stop his family line.
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Oi, this Pizza stinks. Yente, where did you order it from?
From Pizza the Hutt.
Oh, tastes like cardboard.
That's because you're eating the cardboard. The Pizza's on top.
Spoofs The Terminator