When a decaying Russian satellite crashes on the island, the Professor uses a key component for a barometer. With that device, he learns that a massive wave is going to swamp the island. In desperation, the castaways lash their huts together into one structure in order to have any chance to ride the disaster out.
Bob Denver
as Gilligan
Alan Hale Jr.
as Skipper Jonas Grumby
Jim Backus
as Thurston Howell III
Natalie Schafer
as Lovey Wentworth Howell
Judith Baldwin
as Ginger Grant
Russell Johnson
as Professor Roy Hinkley, Jr.
Dawn Wells
as Mary Ann Summers
Vincent Schiavelli
as Dimitri
Art LaFleur
as Ivan
Norman Bartold
as Producer
Barbara Mallory
as Cindy Smith
June Whitley Taylor
as Miss Ainsworth
