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Development Hell: Hoo boy. The film was pitched as far back as 1992 as a straight-laced film adaptation of the series, to be directed by Richard Donner (who had directed several episodes of the series) and with Mel Gibson slated to play Jim West. The duo ended up making Maverick instead. Tom Cruise was then attached to the project before he decided to revamp Mission: Impossible in its place; only then was the project overhauled into the comedic Will Smith vehicle you see today.
Disowned Adaptation: Robert Conrad, who played Jim West on the original TV series, was very vocal in his dislike of the movie, personally accepting the Razzies it "won". His dislike started when they asked him to appear in the movie; on reading the script he described it as an insult to Ross Martin (Artemus Gordon) and Michael Dunn (Dr. Miguelito Loveless). You'd be hardpressed to find a fan of the show who disagrees.