David Orrick McDearmon Director 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 Billy Curtis Royal Messenger Guest Star Robert L. Rosen Producer Herb Finn Writer Alan Dinehart Writer