A romp about the lives of three teens from the Watts section of L.A., loosely based on the 1975 film 'Cooley High.' 'Happening!!' clicked first as a summer-replacement show, and was given a slot on ABC's regular schedule in November 1976. It also inspired a syndicated spin-off, 'What's Happening Now!!,' featuring much of the original cast as young adults. That series ran from 1985 to '88.
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Here's how Emily Deschanel, David Boreanaz and the rest of the gang said goodbye.