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Vengeance is the twenty-second episode of the fourth season of Cannon, and the ninety-fifth episode overall.
Special Guest Star: Clu Gulager (Jonathan Quill)
An ex-convict hires Cannon to call off the hit man he hired to kill him, but Cannon discovers that his client isn't telling him the whole story.
This episode's director, Alf Kjellin, is one of two men to both act in and direct Cannon. Kjellin appeared a few months earlier in "The Man Who Couldn't Forget". (The other Cannon actor-director is Chris Robinson).