Dr. Boris Balinkoff

Personality
Dr. Boris Balinkoff is a mad scientist, who twice has tried to involve the castaways in his crazy schemes. The first time he appears, he reveals that he has discovered a way to put the mind of one animal into the body of another one, and tries to experiment on the castaways, switching their minds―Mr. Howell with Gilligan, Mrs. Howell with the Skipper, Mary Ann with the Professor, and Ginger with his assistant Igor; in the end, everyone gets their own personality back―except for Balinkoff who exchanges minds with a cat, and Igor exchanges minds with a dog. The second time, the Doctor hypnotizes the castaways into becoming robots, so he can rob Fort Knox ― until the castaways drive him away with coconuts and smash his remote control by chance. Igor reappears as a monkey!

Trivia

 * In the first epsiode, the castaways are shown escaping in Dr. Balinkoff's boat back to the Island, where it promptly sinks and strands them again!
 * Goofs - Balinkoff is puzzled to find out Igor changed places with Ginger, yet he was the only one who could have operated the machine, while his two subjects are imprisoned in the machine! Likewise, how can Balinkoff (cat), Igor (dog), cat (Balinkoff), and dog (Igor) escape from the machine, when the lock is on the outside?
 * The second time when Balinkoff tries to turn the castaways into human robots and is speeding away, Gilligan tries to catch him in the Bamboo Island Taxi - and promptly drives it into the lagoon!
 * Vito Scotti also guest starred as a Japanese Sailor, who lands on the Island and doesn't realize that World War II is over. {So Sorry, My Island Now} and {Diogenes, Won't You Please Go Home?} He makes the most appearances in the series over Hans Coreid (2), Denny Scott Miller (2) and Eddie Little Sky (2).