10 Greatest Sequels In Star Trek

10. To The Death

Star Trek: Deep Space Nine forged its own look and feel, drawing from the The Original and Animated Series, as well as The Next Generation.  For the fourth season episode To The Death, the show decided to pitch a sequel to Contagion, while also deepening the lore around the Dominion.

The best sequels add to what is already known. In this case, To The Death confirms what we already knew about the Iconians, but adds greater scope, now revealing that they had travelled as far as the Gamma Quadrant. The episode kicks into gear with an assault on the station - one with fairly serious repercussions.

In this sequel to the Next Generation episode, we learned that the Jem'hadar - an exclusively Deep Space Nine villain at that point - were capable of breaking from their established beliefs and gods, we learned that the Vorta are something of an administrative class within the Dominion, and we learned that Clarence Williams III does not like to be toyed with. 

The episode may simply use the Iconians as the catalyst, but both stories combine to make one of the strongest episodes of the show's fourth year.