How John Travolta has survived the ups and downs of his stellar career and a personal life ravaged by tragedy. In the 1970s, John Travolta was considered Hollywood's Prince of Cool, with breakthrough roles in "Saturday Night Fever" and "Grease" that propelled him to worldwide fame. But throughout his life, for every dizzying career high, he has suffered terrible personal losses, from the tragic death of his girlfriend while filming "Saturday Night Fever" to the death of his beloved mother.