This season, Jeannie's magical and invisible dog from over a thousand years ago returns to terrorize NASA and is later transformed into a porcelain statue mistaken as a priceless ancient artifact from the Ming Dynasty. In a two-part episode, Tony is replaced by a look-alike double agent who unwittingly becomes engaged to Jeannie. Jeannie's wicked twin sister returns to take another go at Major Nelson, only this time in a crowded night club! The cast of "Laugh-In" race to cast Jeannie as Princess Armina in a special guest appearance on their show. Dr. Bellows is replaced by a younger and more aggresive psychiatrist who is dead set on exposing Major Nelson's secrets. With 26 hilarious episodes featuring such guest stars as Judy Carne, Arte Johnson, Gary Owens, and Richard Mulligan, the complete fourth season is every fan's "fourth wish!"