 Peter & his girlfriend Sue are at an old house going through its attic, when one of them discovers a large seed that responds quickly to sunlight. Putting it aside when Sue discovers a large machine - the Glutz Machine - in the attic, Peter turns his attention to the story of the professor who has gone back to 3 million B.C. While he & Sue are investigating, the seed suddenly grows hundredfold in size & rolls through the side of the house and into the street, smashing everything in its way. Sue goes to notify the police, while Spidey heads into the Glutz machine to go back to  Summit City , home of several creatures called vegetons. Spidey discovers that the inhabitants have been driven out of the city by the cold, caused by a nuclear generator created by Von Glutz. The vegetons inform Spidey that other  plants  have taken control of the city and that destroying the generator will destroy the rolling pods. The pod, meanwhile, is threatening an ICBM site, poised precariously on a hill above it. Spidey reaches the generator but is harassed by the vine-things, and after killing several is brought down. In an arena, Spidey is forced to fight a huge carnivorous slug called  Goliath . He overpowers the huge slug and gets the atomic matter from the generator, then heads back to the Glutz machine to return to the present. He arrives just as an order is given to fire a giant cannon at the rolling pod, and drops the atomic matter into the barrel. The gun fires & reduces the pod to rubble.