Starring Frankie Howerd, Bill Fraser, William Mervyn, Linda Gray, Jonathan Cecil, Madeline Smith, Nicholas Bennett, Mike Grady, Dora Byran, Stanley Holloway, Zsa Zsa Gabor, Bob Hoskins, Lance Percival, Patricia Quinn and Robert Coote. Poor old Frankie Howerd has joined the army for World War I while under hypnosis. Now he is up in arms and up to his neck in the trenches with a German Master Invasion Plan tattooed on his backside. And when he drops his trousers to unmask Mata Hari he is even more up the creek.