Jan is one of the main characters in the movie Grease. She is one of the members of the group Pink Ladies. Her boyfriend is Putzie. In a scene from the movie, she invites Putzie to go eat pie at her mother's house (name not reported).
In the movie Grease she is portrayed by Jamie Donnelly, in the 2016 live performance by Kether Donohue, and in the 2017 play version by Stephanie Mercer (alongside her co-star and singer, Jordan Cabrita whom played Mercer's love interest).