A gas-leak at a chemical warfare plant in Alaska increases the rate of neuron depletion in humans over 25, killing off all the adults in the world; a band of happy young people drive across the Southwest in search of a new existence, encountering jock fascists who want to run things like a football game and rival gangs at a country club who have turned the golf course into a mutinous dictatorship. Political allegory with rock music and psychedelic flourishes should have contained funnier satire. From what we can see, the point being made is that--left to their own devices--kids will screw up the planet just as badly as their elders have done. Producer-director Roger Corman, coasting on the exhaust of "Easy Rider", had some quirky ideas, but nothing is developed far enough to sustain interest. Even the bits of outré comedy stop short of becoming revue material (à la TV's "Laugh-In"), though perhaps a more exaggerated format would have been successful here. The handling isn't far-out enough. Some of the low-budget style looks good, and many of the cast members went on to bigger and better things. *1/2 from ****