| Episode: | 063 |
| Season: | 3 |
| First aired in: | 1990 |
| Written by: | Trent Christopher Ganino and Eric A. Stillwell |
| Directed by: | David Carson |
| Teleplay by: | Ira Steven Behr, Richard Manning, Hans Beimler and Ronald D. Moore |
| Stardate: | 43625.2 |
While on a routine mission, the U.S.S. Enterprise-D discovers a bizarre rift in space, which reveals an mysterious vessel, designated U.S.S. Enterprise-C. Both ships are now on an alternate time line where the Federation is in the midst of a bloody war with the Klingons.
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| Guest cast: | Denise Crosby as Tasha Yar Tricia O'Neil as Captain Rachel Garrett Christopher McDonald as Lieutenant Richard Castillo |