Star Trek TNG: "Yesterday's Enterprise" S3/E15 In the "Yesterday's Enterprise" episode of Star Trek: The Next Generation, the crew of the USS Enterprise encounters a temporal rift that brings a previous version of their ship from an alternate timeline into their reality. This alternate timeline is darker, with the Federation at war with the Klingons. As they grapple with the consequences of this alternate reality, the crew must decide whether to restore the timeline they know or allow the [...]