John Travolta – John Travolta's role as Vinnie Barbarino preceded many of the actor's shining moments, such as his starring roles in "Saturday Night Fever," "Look Who's Talking" and "Pulp Fiction." Travolta currently plays Dennis in "Savages" and will next appear as Emil Kovac in 2013's "Killing Season."
Gabe Kaplan – Since creating and starring in "Welcome Back, Kotter," comedian Gabe Kaplan, 67, had shown up in several projects, including the short-lived NBC sitcom "Lewis & Clark."
Lawrence Hilton-Jacobs – Lawrence Hilton-Jacobs, 58, has continued acting since making a name for himself as Freddie "Boom Boom" Washington. He took on the role of Joseph Jackson in the 1992 TV movie "The Jacksons: An American Dream," and has appeared on shows like "Roseanne," "Moesha" and "Gilmore Girls."
Marcia Strassman – After playing Julie Kotter, Marcia Strassman, 64, forayed into family films playing Diane Szalinski in 1989's "Honey, I Shrunk the Kids" and 1992's "Honey I Blew Up the Kid." She's also been on several short-lived series, such as "Booker," "Noah Knows Best" and "Tremors."
John Sylvester White – Mr. Michael Woodman, the vice principal-turned-principal of Buchanan High, was played by John Sylvester White. He died in September 1988 -- almost 10 years after the show went off the air.