22. Is That Tasha?
Episode: Redemption (4.26)
The first half of Redemption is a pretty decent foray into Klingon/Romulan politics, and we think the cliffhanger is that Worf is resigning his commission to join the Klingon Civil War. But then we get slammed with the real cliffhanger.
Episode: Tapestry (6.15)
Seeing Picard change his past and wind up as a weaker version of himself is fun and heartbreaking. The final scene, where Picard recounts his near-death adventure from Q with Riker, is incredibly poignant.