Star Trek: 12 Subplots That Went Nowhere

Ah Sela, problematic offspring of "concubine" Tasha Yar and a Romulan general – Denise Crosby's half-Romulan, all sideburns antagonist never got the storyline or sendoff she truly deserved.

Yes, Sela was the mastermind of the Klingon Civil War as hinted at in "The Mind's Eye" and ultimately dramatized in the "Redemption" arc, but Sela's true story began a season prior in "Yesterday's Enterprise", when her mother traveled back in time and was captured by the Romulans. We learned of Tasha's fate and the origin of Sela in "Redemption", but the character's past and her connection to the crew of the USS Enterprise-D was never fully explored in just four appearances in Star Trek: The Next Generation.

There's no evidence the producers had any intention of fully fleshing out Sela's character following her stock villain turn in "Unification II", but she was a character fans expected to return, even as late as 2002's Romulan-centered Star Trek Nemesis.

With "Yesterday's Enterprise" being among the franchise's most beloved episodes and the revelation of her past in "Redemption" left dangling, Sela represented a huge well of story potential that was bafflingly forgotten by the producers.