Ray Walston returns as mercurial Martian "Uncle Martin" in this 1960s television series that co-stars Bill Bixby as harried reporter Tim O’Hara, who never knows when his houseguest will manifest his alien powers, such as invisibility and levitation. In the second season, Martin wards off a nosy psychic, becomes a popular folk singer, feels lonely on Martian Mother's Day, and constructs a time machine that whisks him and Tim to Medieval England.