2. 'Mork and Mindy'
Robin Williams' lovable alien character Mork from Ork first appeared in a 1978 episode of Happy Days where he attempted to take Richie Cunningham back to his home planet for study. (Happy Days got really weird sometimes.) The character was such a hit that he quickly got his own show, somehow jumping forward in time to present-day Boulder, Colorado. It turned Robin Williams into a superstar, but it only lasted four seasons.