Gilligan's Island (1964)

S03E16 Take a Dare

George Barkley decides to take part in the "Take a Dare Contest," where he has the chance to win $10,000 if he can survive a week on a deserted island by himself. However, he quickly discovers that he is not truly alone. As the days pass, George realizes he must keep the existence of other castaways a secret to avoid losing his prize money for failing to stay solo. With rescue proving elusive, he faces the challenge of navigating both the island and his dilemma.