4-13: Return To Grace
Kira assists Gul Dukat, now in command of a freighter, to stop a Klingon Bird-of-Prey that destroyed an outpost with a joint Bajoran and Cardassian delegation.
4-01: The Way of the Warrior, Part I
When a Gowron-lead fleet of Klingon attack ships arrives at DS9, Sisko calls in a familiar Klingon expert for reinforcement.
4-21: For The Cause
Sisko's loyalties are tested when his girlfriend, Kassidy Yates, is an accused Maquis collaborator.