"He's not the alien. YOU are."
Sinbad plays Ari, an alien who comes to Earth in a cereal box in order to warn a kid about an imminent alien invasion.
The X Files: I Want to Believe
Titan A.E.
The Hitchhiker's Guide to the Galaxy
They Live
Transformers: Revenge of the Fallen
The Wild Blue Yonder
Aliens: Zone-X