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John Travolta may be remembered as one of Hollywood’s biggest stars, but his journey on Welcome Back, Kotter began with unexpected challenges. The young actor, cast as Vinnie Barbarino, faced criticism during the pilot episode that shook his confidence. According to series co-creator Gabe Kaplan, one of the producers thought Travolta’s performance during that first taping was far from what he had shown in rehearsals. In a new essay reflecting on the show’s 50th anniversary, Kaplan recalled how producer James Komack questioned whether Travolta’s approach would get the series on the air. The harsh feedback left the actor unsettled, though Kaplan assured him he was doing well. For John Travolta, those early doubts only set the stage for the growth and resilience that would define his career. John Travolta’s Transformation As Vinnie Barbarino John Travolta/Imagecollect The team taped the pilot a second time, and this round went far better. Kaplan remembered that the improvement allowed both himself and John Travolta to settle into their roles more comfortably. For Travolta, the turning point came when he drew inspiration from Robert De Niro’s Johnny Boy in Mean Streets. The edgy energy of that performance helped him discover a “new soul” for Barbarino, shaping the swagger and unpredictability that would make the character unforgettable. WELCOME BACK, KOTTER, from left: Ron Palillo, John Travolta, Lawrence Hilton-Jacobs, Robert Hegyes, Gabe Kaplan, (ca. 1977), 1975-79. photo: Frank Teti/TV Guide/courtesy Everett Collection According to People, as Barbarino developed, Travolta introduced catchphrases that audiences would come to love. Lines like “What? Where? When?” and “I’m so confused” became part of the character’s charm. Komack resisted these additions, worried they weakened the character, but fans embraced them wholeheartedly. For John Travolta, those phrases not only defined Barbarino but also highlighted his instinct for what resonated with viewers. From Sitcom Star To Hollywood Icon WELCOME BACK, KOTTER, from left, Lawrence Hilton-Jacobs, Robert Hegyes (back), Ron Palillo, John Travolta, and Gabe Kaplan, 1975-79 (1976 photo). ©ABC / courtesy Everett Collection By the time Welcome Back, Kotter premiered in September 1975, audiences immediately gravitated toward Barbarino. The role made John Travolta the breakout star of the series, setting him apart from his castmates. Though Komack continued to raise concerns about certain aspects of Barbarino’s persona, the character’s popularity was undeniable. WELCOME BACK, KOTTER, John Travolta, 1975-1979/Everett Collection The show ran until 1979, but Travolta’s career had already skyrocketed. With starring turns in Saturday Night Fever and Grease, he transitioned from television to film seamlessly, becoming one of the era’s most bankable actors. Looking back, the rocky pilot and the tension with Komack seem like small obstacles compared to the success Travolta ultimately achieved.