Stardate 43625.2: When a mysterious ship appears from a temporal rift, the reality on the Enterprise-D changes in an instant. Worf is gone, but Tasha Yar is alive. The Federation is now at war with the Klingons. The other ship is the Enterprise-C that was lost with all hands 22 years ago when the ship defended the Klingon outpost at Narendra III against the Romulans. Only Guinan can feel that something has changed, and she apprises Picard. The fact that the Enterprise-C is missing from the past and hence could not support the Klingons is the reason for the war, as Picard surmises. Guinan convinces Picard to send the Enterprise-C back to correct history. When she learns from Guinan that she should be dead, Tasha decides to stay on the Enterprise-C, although the ship is facing a hopeless battle. Just when the Enterprise-D is about to be destroyed by Klingon ships, the Enterprise-C enters the rift, and the original history is restored.

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