The Substitute: Failure Is Not an Option
2001 film directed by Robert Radler

The Substitute: Failure Is Not An Option (also known as The Substitute 4) is a 2001 action thriller film directed by Robert Radler and starring Treat Williams as Karl Thomasson, a former mercenary who must infiltrate a military school's faculty to stop the actions of a white supremacist cult. The film is the fourth and final installment in The Substitute series and was released direct-to-video.
Plot
Captain Karl Thomasson (Williams), an ex-Special Forces soldier and retired mercenary, is approached by his old army buddy Teague who gives him a mission: working undercover at a military school where Ted, Teague's nephew, is one of the cadets. Teague believes that the cadets and the student faculty are part of a group of neo-Nazis called the Werewolf Unit. Officially, the Werewolves are a special unit being run at the school. Karl accepts the mission and begins working as a history teacher at the school, seeking to expose and eradicate the unit.
While investigating, Karl teams up with Devlin, a martial arts teacher at the school who served with Karl in the U.S. Army. They learn that Colonel J.C. Brack (Patrick Kilpatrick) is leader of the unit and Ted is one of the cult members.
During his investigation, Karl befriends and falls for Dr. Jenny Chamberlain (Angie Everhart) who believes that the Werewolf Unit is just another elite group and is unaware of their clandestine assignments.
The public source identifies “The Substitute: Failure Is Not an Option” as 2001 film directed by Robert Radler. This brief keeps that definition visible, then builds a research path around Substitute, Failure and Option.
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Object files, edition statements, performance records and contemporary criticism preserve different stages of the work’s history. The source revision retrieved here is dated Jul 16, 2026. The linked authority identifier is Q7767157. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2001.
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This entry incorporates text from “The Substitute: Failure Is Not an Option” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.