Shelley Thompson. Shelley Thompson (born March 9 1959) is a Canadian actress. Thompson played Sarah's step-mother in Labyrinth. Career Thompson is best known for her recurring role in the Canadian mockumentary series, Trailer Park Boys. Retrieved from "https://labyrinth.fandom.com/wiki/Shelley_Thompson?oldid=4650" Categories: Cast and Crew Community content is available under CC-BY-SA unless otherwise noted.