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Hollywood's Secret Sitcom Stars

14 of 17

John Travolta: 'Welcome Back, Kotter'

John Travolta first garnered recognition in the 1970s, but not for his roles in "Grease" and "Saturday Night Fever." Prior to landing those now-famous parts, Travolta appeared as Vinnie Barbarino in the TV sitcom "Welcome Back, Kotter." —XFINITY Entertainment Staff (Photos: Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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