From Mork to Madman: Robin Williams' Most Memorable TV Appearances

Check out some of Williams' wackiest, wittiest small-screen turns

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'Happy Days'

Williams' big break came in the form of a two-episode appearance on Happy Days in 1978 and 1979, where his character Mork — an alien from the planet Ork — originated. (The then-unknown actor landed the role by sitting on his head during his audition with series creator Garry Marshall.) Originally planned as a one-off gig, Williams stole the show in the episode "My Favorite Orkan," earning him a encore ("Mork Returns") and his own spinoff, Mork & Mindy.