Apart from that initial scene between Laurie and her tormentor, which was played by Castle, Michael (aka "The Shape") is played by actor James Jude Courtney in the 2018 "Halloween." He's the one you'll recognize in that opening prison scene as well as the majority of the rest of the film.
While he's not a household name, Courtney has appeared in a number of big film and TV projects. He appeared alongside Tom Cruise and Nicole Kidman in "Far and Away," starred with Meg Ryan and Andy Garcia in "When a Man Loves a Woman," and even had bit parts in "Buffy the Vampire Slayer" and "Babylon 5."
Courtney appeared in "Halloween Kills" and reprised his role in "Halloween Ends" as well.
