Eleven seasons, 256 episodes, and one of the most-watched finales in TV history — MASH* was a cultural phenomenon. But with more than a decade of storylines to fill, even the sharpest writers occasionally lost track of what they’d already done. In one surprising case, the show literally remade its own episode without realizing it.

The mix-up came in season 7’s “Preventative Medicine.” The episode centers on a dark moral dilemma: Hawkeye and B.J. argue over whether it’s acceptable to perform unnecessary surgery on a reckless commander whose poor leadership is getting soldiers killed.
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