TNG - Skin of Evil

Skin of Evil was one of the best episodes of TNG’s first season. The episode made interesting comments on the nature of evil and the human sprit. This episode also marked the first time that a regular on a Star Trek series would be killed off permanently. Yar's death in this episode allowed Worf to become chief tactical officer, allowing Worf’s character to develop rapidly thought the rest of the series. Yar’s death also paved the way for Denise Crosby to return to Star Trek, as a more interesting character(s), in some of TNG’s best episodes, like Yesterday’s Enterprise, and Redemption.