John Travolta
John Joseph Travolta (born February 18, 1954) is an American actor, film producer, dancer, and singer. Travolta first became known in the 1970s, appearing on the television series "Welcome Back, Kotter" (1975–1979) and starring in the box office successes "Saturday Night Fever" (1977) and "Grease" (1978). His acting career declined through the 1980s, but enjoyed a resurgence in the 1990s with his role in "Pulp Fiction" (1994), and he has since starred in films such as "Get Shorty", "Broken Arrow", "Face/Off", "Swordfish", "Be Cool", "Wild Hogs", "Hairspray", and "The Taking of Pelham 123".
John Howard (American actor)
According to David Shipman, "Howard..., was tried out in various capacities - supporting roles in A movies, and leads in Bs and on loan-outs. These last could be significant: the smaller studios had restricted contract lists and were prepared to pay well to borrow good- looking guys whose acting consisted mainly of not bumping into the furniture." 
Howard's first memorable role came on loan out to Columbia: as Ronald Colman's younger brother in "Lost Horizon" (1937), directed by Frank Capra. Capra had seen him in "Annapolis Farewell" and arranged for a screen test. The film was a huge success and really established Howard, who later said "without "Lost Horizon" I doubt very much whether I would have survived in Hollywood".