Max, Virgil, and Norman must prevent the earth from being invaded by brain sucking space aliens. The only way to do this is for Max to make amends with Ernie, his nerdy loudmouth lab partner from school. Ernie is the only one that can crack the computer codes on the aliens' disks

Max's mom brings a figurine back from Haiti that turns out to be filled with zombie parasites.

Construction unearths and frees an immortal saber tooth tiger that begins to wreck havoc on modern day California. Also freed is an immortal caveman who has spent most of his life battling this unstoppable enemy. He joins forces with Max, Norman, Virgil, and Mom to stop a creature that should have been extinct a long time ago.