An ape, lost in space, crash-lands back to Earth. The vessel oozes a sludge that triggers massive growth in both the ape, as well as a passing Gila monster. Their paths cross again, leading to a giant brawl.

Un experimento científico cuyo fin era crear una fuente de energía inagotable ha fracasado y desencadenado una serie de huracanes que atraviesan Norteamérica.