<P> The gang celebrates graduation at a school carnival where Rizzo tells Kenickie she isn't pregnant and they reunite . Danny arrives wearing a letterman's sweater, to the other T - Birds' dismay . Sandy shocks everyone when she arrives with a new, wilder hairstyle and wearing a revealing black outfit and leather jacket . In song, Danny and Sandy reaffirm their commitment to each other ("You're the One That I Want"). As the film ends, the greasers promise to stay together after school ends ("We Go Together") and Danny and Sandy depart in a red hot rod, which takes flight as they wave goodbye to their friends . </P> <Ul> <Li> John Travolta as Danny Zuko, who lives a double life as leader of the greaser gang the T - Birds and as Sandy's boyfriend </Li> <Li> Olivia Newton - John as Sandy Olsson, Danny's girlfriend and an Australian expatriate and ingénue, who transforms from square to greaser </Li> <Li> Stockard Channing as Betty Rizzo, Kenickie's girlfriend and the cynical leader of the Pink Ladies clique </Li> <Li> Jeff Conaway as Kenickie, Danny's best friend, Rizzo's love interest and the owner of Greased Lightnin' </Li> <Li> Barry Pearl as Doody, a member of the T - Birds; he pairs with Frenchy at the school dance </Li> <Li> Michael Tucci as Sonny LaTierri, a trouble - making wannabe womanizer and T - Bird who courts Marty with little success over the course of the film </Li> <Li> Kelly Ward as Putzie, a member of the T - Birds whose relationship with Jan builds over the course of the film </Li> <Li> Didi Conn as Frenchy, Sandy's closest friend in the Pink Ladies and an aspiring beautician </Li> <Li> Jamie Donnelly as Jan, a quirky member of the Pink Ladies with a liking for Ipana toothpaste </Li> <Li> Dinah Manoff as Marty Maraschino, a member of the Pink Ladies whose attractiveness regularly draws the attention of men, including Sonny and Vince Fontaine </Li> </Ul> <Li> John Travolta as Danny Zuko, who lives a double life as leader of the greaser gang the T - Birds and as Sandy's boyfriend </Li> <Li> Olivia Newton - John as Sandy Olsson, Danny's girlfriend and an Australian expatriate and ingénue, who transforms from square to greaser </Li>

Who is the leader of the t-birds in grease