Grease. Danny Zuko (Travolta) and Sandy Olsson (Newton-John) had the perfect summer romance. But Labor Day comes all too soon for the pair, and they must go off to their separate schools, each mistakenly thinking that this is the end. Welcome to the singing and dancing world of “Grease. with Danny, Sandy, Rizzo, Frenchy and all the Rydell High gang. Who could resist all those infectious songs performed by John Travolta, Olivia Newton-John, Stockard Channing, Frankie Avalon, Sha-Na-Na, Frankie Valli and the rest of the cast?