Best Defense was originally conceived as a Dudley Moore vehicle centered entirely on engineer Wylie Cooper, whose dishonest acquisition of a murdered rival's tank-gyro design drives the film's darker comic plot. After preview audiences reacted badly, Paramount attempted an emergency commercial rescue by adding Eddie Murphy, then one of Hollywood's hottest stars following 48 Hrs. and Trading Places. Murphy's character, tank commander T.M. Landry, was inserted through newly filmed material that was only loosely connected to Moore's storyline. The two characters were not originally designed to interact, and even a reshot scene in which Cooper and Landry met was ultimately removed. To make room for Murphy's footage, filmmakers cut scenes that had been important to the original narrative, leaving a film built from two parallel stories that barely acknowledge each other. The result was widely criticized as disjointed and incoherent rather than saved by the star addition.
The studio's gamble produced a particularly embarrassing aftermath. Best Defense opened in July 1984 behind Ghostbusters but quickly collapsed, earning approximately $19.2 million and receiving a lowly C from CinemaScore; it was also nominated for Worst Picture at the Stinkers Bad Movie Awards. Murphy later turned the production into a public punchline during his December 1984 Saturday Night Live monologue, bluntly explaining that he had initially rejected the script because he thought it was terrible, then accepted after seeing how much money Paramount was offering. His admission—"Best Defense turned out to be the worst movie ever done"—became part of the film's legend and illustrated the commercial desperation behind the studio's last-minute surgery.
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