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. The wave strikes the island and the hut is swept out to sea.
Actors: Bob Denver, Alan Hale Jr.
Director: Leslie H. Martinson
Additional Actors: Jim Backus