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What "Star Trek: The Next Generation" 15-th episode about
Stardate: 43625.2 A time rift opens up in front of the Enterprise. A battered and abused starship comes through from 22 years in the past. It is the Enterprise-C, the predecessor to the modern ship. A terrible battle which almost destroyed it has opened the rift. As the Enterprise-C comes through the rift, however, the end of its presence in the past drastically alters the present, and Lt. Worf is replaced by the formerly deceased Tasha Yar... The Enterprise-C's failure to be where it needed to be has led to a very different present, victim of a long and drawn-out war between the Federation and the Klingon Empire, leading to the passing of billions. Only Guinan senses the change, and, warning Picard, he must make a choice - to send back the ship through the rift, to almost certain doom, trusting Guinan's assurances that his present was never meant to be. Or to save the 125 surviving crewmembers.
Episode number: 15
Episode name: "Yesterday's Enterprise"
Episode release date: 20 february 1990 at 01:00
Status: aired
Rating: 9.2