S1·E7 Identical Problem/Julie's Old Flame/The Jinx
Aired November 5, 1977
Synopsis
Identical twins pretend to be one person in order to take the cruise on one fare. They leave Doc completely bewildered. Julie gets re-acquainted with an ex-lover, who claims to have broken things off with his wife. After suffering a series of accidents, the crew comes to believe that an elderly couple--which survived the Titanic--is cursed.