A rock-star/brain-surgeon/comic-book-hero/samurai must stop evil creatures from the 8th dimension who want to conquer our dimension.
Back to the Future
Back to the Future Part II
Back to the Future Part III
Paul
Galaxy Quest
Spaceballs
The Hitchhiker's Guide to the Galaxy
Idiocracy
G.O.R.A.
The Adventures of Buckaroo Banzai Across the 8th Dimension