He is the arch nemesis and former psychiatrist of masked serial killer Michael Myers. Loomis' history is complicated by the fact that the series follows several conflicting continuities. Halloween H20: Twenty Years Later and Resurrection ignore the events of Halloween 4, 5, and 6, splitting the series into two separate timelines both originating from the original film and its sequel. The 2007 remake reboots the series continuity altogether, starting the timeline afresh. He was portrayed by the late Donald Pleasance (who also played Dr. John McGregor in Phenomena and Priest in Prince of Darkness) in the original and Malcolm McDowell in the remake.