In Purgatory’s Shadow and By Inferno’s Light represent a fantastic accomplishment for Star Trek: Deep Space Nine.
In keeping with the television of the time, the first Star Trek show had been firmly episodic, to the point that there are arguments about the order in which episodes happened. Even in the context of the early nineties, Star Trek: The Next Generation tended to shy away from making dramatic decisions with huge consequences. The Klingon Civil War is resolved in Redemption, Part I and Redemption, Part II. The failed Romulan invasion of Vulcan in Unification, Part I and Unification, Part II is never mentioned again.

“Mister Worf, we really shouldn’t have mounted this mission during Sweeps.”
Deep Space Nine grew increasingly adventurous over the course of its run. The series had flirted with up-ending the status quo before, from the introduction of the Defiant and the Founders in The Search, Part I and The Search, Part II through to the dismantling of the Khitomer Accords in The Way of the Warrior. While those decisions had very long-term consequences for the show, their impact was not as dramatic and immediate as that seen here. Even the defeat of the Cardassians and Romulans in Improbable Cause and The Die is Cast took time to ripple down.
In contrast, In Purgatory’s Shadow and By Inferno’s Light change a lot of what the audience think they know about Deep Space Nine. The fifth season pivots on this two-parter, which serves to enable just about every major dramatic development between this point and the end of the series. This only serves to make it all the more impressive that the two-parter is so firmly rooted in its characters and characterisation.

Gripping drama.
Filed under: Deep Space Nine | Tagged: Bashir, cardassians, continuity, ds9, klingons, star trek, star trek: deep space nine | 7 Comments »