Ephraim Winslow is a fictional character from the 2019 film The Lighthouse, directed by Robert Eggers. He is portrayed by actor Robert Pattinson and serves as a young assistant to an older lighthouse keeper. The story unfolds in the late 19th century, focusing on their isolated life on a remote island. In the film, Ephraim struggles with his sanity as he faces the harsh conditions of the lighthouse and the eccentric behavior of his superior, Thomas Wake, played by Willem Dafoe. The narrative explores themes of isolation, madness, and the supernatural, creating a tense atmosphere throughout the film.