Peter Marinker is a London-based Canadian actor of theatre. Apart from his roles in theatre, he has had roles in Judge Dredd, Event Horizon and has dubbed for Sam J. Jones in Flash Gordon. In 2024 he was diagnosed with Alzheimer's disease after he felt he was "switching off" during the performances of a stage version of The Lord of the Rings where he played Gandalf. In spite of his diagnosis, he has started rehearsing for a production of Samuel Beckett's one-act show, Krapp's Last Tape where the main character will listen back to his own performance of the play in 1983.