They Were Eleven

Ten students from the Cosmo Academy board a derelict ship for their final exam, which is to survive aboard it for more than fifty days. Once they are inside, Tada (Akira Kamiya) and Frol (Michiko Kawai) count the crew and come up with eleven. Directors Satoshi Dezaki and Tsuneo Tominaga turn the headcount into a puzzle, since every one of them knows the extra person is among them and cannot say who.