The X-Files
S7E20: Fight Club
The Agents cross paths with a pair of doppelgangers whose close proximity with each other leaves a trail of destruction across 17 states. Mulder and Scully must first understand why this is happening before they can stop it. But the Agents soon realise that the only way to stop the destruction is by stopping the girls meeting up, but this becomes difficult when both fall in love with the same man.
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