Robin Williams, Garry Marshall, Conrad Janis, Dale McRaven, Pam Dawber, Joe Glauberg, Jonathan Winters, Bob Claver, Cindy Begel, Lesa Kite

P.S. 2001 is an episode of Mork & Mindy starring Robin Williams, Pam Dawber, and Conrad Janis. Mearth attends school on Ork where he's teased for being an "Earth-head".