Sinister Turtlenecks (S3E15)
When a butthole in space expels a version of the Enterprise from the past, the crew we've come to know are changed in ways no one can perceive - except for Guinan. In this alternate reality, the Klingons are eating the Federation for breakfast, and Captain Picard has to decide whether or not to send the visiting ship back to its own time. Could Worf be a "secret old"? Shouldn't Yar be due for a promotion by now? Is Ben's dog okay? It's the episode with no logic in it at all!