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.

When an alien spaceship crash-lands in the desert, a giant ape and monster are unleashed on Washington D.C. As the military tries to stop the creatures, a female soldier must reunite with her father and join forces with a team of scientists to save the city.

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.