My Favorite Orkan
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 TV series Happy Days, "My Favorite Orkan". Sought after as a last-minute cast replacement for a departing actor, 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. The cast and crew, as well as TV network executives, were deeply impressed with his performance.