Complaining that Francis the Mule was getting more fan mail than he was, Donald O'Connor bade adios to the "Francis" series with this 1955 entry. Once more, O'Connor plays Army lieutenant Peter Sterling, who heads to a navy base when it looks like his old pal Francis is about to be auctioned off as surplus. In short order, Sterling is mistaken for a bos'n's mate whom he resembles, and it's off to sea for both Peter and the mule. Among the able-bodied seamen in this film is a chap named Jonesy, played by a young Clint Eastwood in his second movie appearance. An eleborate slapstick finale brings this one to a rousing conclusion. Director Arthur Lubin likewise left the "Francis" series after Francis in the Navy; the next (and last) entry, Francis in the Haunted House, starred Mickey Rooney and was directed by Charles Lamont.