8. ‘Doctor Detroit’ (1983) — Sequels That Never Happened

Another fish-out-of-water comedy was 1983’s 'Doctor Detroit,' in which Dan Aykroyd plays a nerdy college professor who assumes the role of a freaky urban pimp with a metal hand. At the film’s end, after Dr. Detroit defeats his rival pimp (an older woman named “Mom”) the closing credits warn us that there’s to be a sequel titled 'Doctor Detroit II: The Wrath of Mom.'  (A play upon the Star Trek sequel 'The Wrath of Khan.') While this was probably a gag, we're still waiting for the return of Howard Hesseman's "Smooth Walker."