After the Laugh-In revival and appearing in the cast of The Richard Pryor Show on NBC, Williams was cast by Garry Marshall as the alien Mork in a 1978 episode of the hit TV series Happy Days. Williams impressed the producer with his quirky sense of humor when he sat on his head when asked to take a seat for the audition. As Mork, Williams improvised much of his dialogue and physical comedy, speaking in a high, nasal voice. Mork's appearance was so popular with viewers that it led to the spin-off hit television sitcom Mork & Mindy, which ran from 1978 to 1982, the show was written to accommodate Williams's improvisations.

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