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Parallels

Returning triumphant from a Klingon martial arts competition, Worf walks right into a surprise birthday party, but notices that something is amiss aboard the Enterprise; events begin contradicting themselves, and cause no longer leads to a logical effect. His environment and his comrades change - Troi suddenly believes she is Worf's wife; Geordi is killed in engineering during a Cardassian assault. Worf alerts Data to the strange occurrences, and Data begins to research a way to send Worf back to his original universe. Further disparities appear, including Riker's command since Captain Picard's death in the Borg invasion several years ago, and Worf's two children (neither of them Alexander) by Troi. Data discovers the way to send Worf back...but when Enterprises from every possible variation of every potential reality appear, not every crew wants reality restored to its normal flow.

The Next Generation, seizoen 7