Star Trek: The Motion Picture--Echoes

A space anomaly brings a bounty hunter and her target, a criminal mastermind, into Kirk's universe, posing a threat of war with the Romulans. As Kirk and his crew race against time to prevent chaos, they discover that their adversaries are not just strangers but alternate versions of themselves from a parallel reality. This twist adds layers of intrigue and conflict as they grapple with the implications of facing their doppelgängers while trying to avert disaster.