Bob Denver Gilligan Actor Alan Hale Jr. Jonas "The Skipper" Grumby Actor Jim Backus Thurston Howell III Actor Natalie Schafer Mrs. Lovey Howell Actor Tina Louise Ginger Grant Actor Russell Johnson Roy "The Professor" Hinkley Actor Dawn Wells Mary Ann Summers Actor Chick Hern Commentator Guest Star George N. Neise NASA Official Guest Star Scott Graham Sol Tobias Guest Star James Spencer Ryan Guest Star Jerry Hopper Director Sherwood Schwartz Producer John Fenton Murray Writer