An ape crash-lands on Earth, which creates a sludge that makes him and a passing lizard grow to giant-size, resulting in a fight for dominance.

Recognizing the destructive power of its captive giant Ape, the military makes its own battle-ready A.I., Mecha Ape. But its first practical test goes horribly wrong, leaving the military no choice but to release the imprisoned giant ape to stop the colossal robot before it destroys downtown Chicago.

A group of world leaders awakens a creature beneath the ocean floor, and mankind's only hope rests on an alliance between the giant ape and his mechanical arch-nemesis.