Dr. Sam Loomis

Loomis treats Michael for fifteen years and concludes there's nothing human left. When he escapes, Loomis races to Haddonfield and warns the police. On Halloween night he finds the killer on top of Laurie and fires six shots. Michael falls from the balcony and vanishes.

That same night, Loomis keeps hunting through town and learns Laurie is Michael's sister. He heads to the hospital, where the final confrontation takes place in an operating room. To end the story he pays a steep price.

Loomis survived, face scarred, and still believes Michael is alive. When the killer wakes from his coma, Loomis returns to Haddonfield and tries to protect little Jamie Lloyd. For him, nothing has changed in ten years.

A year later, Loomis's obsession gets more dangerous. He notices the link between Jamie and Michael and starts using it to track the killer. The girl becomes bait, and Loomis himself begins to seem unstable.

Retired, Loomis returns to Haddonfield when Tommy Doyle asks for help. He meets an old colleague, Dr. Wynn, and faces the Cult of Thorn, tied to Michael. It's Donald Pleasence's last role; he died before the release.

In Rob Zombie's remake, Loomis is a psychiatrist who treats Michael as a child. He builds a bond but pulls away as the boy gets worse. Years later he writes a book about the case, which will leave scars.

In Rob Zombie's Halloween II, Loomis tours to promote his book about Michael. The fame weighs on him, and he comes to be seen as someone who profited from the tragedy. The doctor has to face his own part in it all.

Donald Pleasence plays Loomis in 1978, Part II, 4, 5 and 6. Malcolm McDowell takes over in both Rob Zombie films. Loomis is only mentioned in H20 and doesn't appear in the 2018 trilogy.