*Sandra Dee "Sandy" Dumbrowski (Olsson in the 1978 film adaptation) is one of the main characters in Grease.

Sandy and her family moved to America from Sydney, Australia, after summer vacation. She is the girlfriend of Danny Zuko and the cousin of Michael Carrington. Even though she didn't become a member of the Pink Ladies, as Rizzo, the leader, thought she was "too pure to be pink," she was later accepted.

Sandy was born and raised in Sydney, Australia, to two parents. During one summer vacation, her parents took her to the beach and she met an American named Danny Zuko. They had a summer fling together and fell in love, though he had to go back to America and she to Australia. Unbeknownst to either of them at the time, Sandy's parents planned to move to America after vacation, to a small town in California called Rydell.

Sandy is an extremely beautiful, lovely, attractive, radiant and gorgeous Australian young lady with blonde hair, blue eyes, and a fair complexion. Throughout the majority of the film, Sandy wears very feminine clothes, such as a skirt-and-sweater set that are always in pastel colors, like yellow and pink, etc. At the National Dance-Off, she is wearing a white dress and matching white high heels (and, although seen very briefly, matching white panties). At the end of the movie, Sandy undergoes a complete makeover and transformation with the help of Frenchy to surprise Danny.

Sandy is very good-natured, speaks kindly to everyone, and has a very kind and sweet personality. She was deemed "too pure" in contrast to the other Pink Ladies by Rizzo. While at a pajama party at Frenchy's house, a puff from a cigarette and a sip of dessert wine - along with the sight of blood after Frenchy pierced her ear - made her sick. She is trusting, a little naïve, and is easily hurt. She finally gained confidence and changed her "pure" image into a rebel-like appearance and attitude to be with Danny, who at the end of the school year had lettered in track, to soften his image to be with her.*