"Na-Nu Na-Nu." After an appearance on "Happy Days," Robin Williams brought his wild antics as the quirky, misfit alien Mork to this popular 1978-82 sitcom. Sent to Earth from the planet Ork to study human behavior, Mork lands his egg-like spaceship in Colorado where he befriends-and later falls in love with-Mindy McConnell (Pam Dawber). With Conrad Janis, Elizabeth Kerr, and, in the fourth season, Jonathan Winters as Mearth.24 episodes on 4 discs. 10 1/2 hrs. Standard; Soundtrack: English.