In the early 1960s, Rydell High School is still buzzing with teenage energy. The Pink Ladies, a clique led by Stephanie Zinone, dominate the social scene alongside their male counterparts, the T-Birds. Stephanie is tired of her relationship with T-Bird leader Johnny and dreams of dating someone more sophisticated. Enter Michael Carrington, a British exchange student and cousin of Sandy from two years prior. Shy and academically inclined, Michael is initially out of place but becomes infatuated with Stephanie. He decides to win her heart by transforming into a mysterious motorcyclist, learning how to ride and donning a leather-clad, helmeted guise.

As Michael adopts his new secret identity, he draws the admiration and attention of the entire school, especially impressing Stephanie with his daring motorcycle stunts. Meanwhile, tensions are brewing within the T-Birds as Johnny struggles to maintain his authority while dealing with his feelings for Stephanie and competition from the enigmatic biker. Michael juggles his academic responsibilities and secret life, crafting comedic ploys to keep his dual identities hidden. A series of events at school, including talent shows and sporting competitions, provide lively backdrops where relationships develop and personal growth ensues. Themes of identity, self-discovery, and challenging societal norms unfold as the school year progresses towards its festive climax.