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Four teenaged couples arrive in a town after their car is wrecked in an avalanche. Young lovers Mike and Nancy are interrupted by Nancy's younger brother, Genius, an amateur scientist who announces he has discovered a food-like substance which causes those who eat it to grow to enormous size. Hearing about the substance, the eight teenagers steal some, try it out, and grow into giants. They take over the town, holding the sheriff's daughter hostage; but Genius discovers a vapor which acts as an antidote, and the invaders are chased from town after they return to normal size.