"In Purgatory's Shadow" is the 112th episode of the television series Star Trek: Deep Space Nine, the 14th episode of the fifth season. The episode premiered on February 10, 1997 to a Nielsen rating of 6.7 points. It is the first half of a two-part episode, with the second half, "By Inferno's Light", first airing a week later. This episode is dedicated "In memory of Derek Garth", a grip for the series who died in an automobile accident in December, eight weeks before the episode aired.