And Then There Were None One by one, all of the Castaways mysteriously disappear. Gilligan then dreams that he is Dr. Jekyll and Mr. Hyde. In the end, Gilligan rescues them from the hidden World War II munitions pit that they have all fallen into. Details Casts Title And Then There Were None Genres Comedy Family Release Date 1966-12-05 Episode Runtime 00 Hours 25 Minutes Season Number 3 Episode Number 13 Production Companies United Artists Television, CBS, Gladysya Productions Bob Denver Gilligan Alan Hale Jr. Jonas "The Skipper" Grum? Jim Backus Thurston Howell, III Natalie Schafer Eunice "Lovey" Wentworth? Tina Louise Ginger Grant Dawn Wells Mary Ann Summers Russell Johnson Roy "The Professor" Hink?