Successfully complete the indicated task to unlock the corresponding movie under the "Archives" menu:

Closing: Successfully complete the game.
Closing Animatic: Collect 50 Alien Artifacts and successfully complete the game.
Destroy All Humans Wrap Party: Collect 10 Alien Artifacts.
Intro Movie Happy Mix: Collect 30 Alien Artifacts.
Opening Movie Animatic: Collect 20 Alien Artifacts.
Salad Days With Pox And Crypto: Collect 40 Alien Artifacts.