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.
4-03: The Visitor
When a freak accident traps Sisko in a time paradox, only re-appearing every few years, Jake spends the remainder of his life trying to save him.
4-15: Bar Association
Quark’s frustrated employees organize a union and strike, prompting intervention from Liquidator Brunt of the Ferengi Commerce Authority.
4-08: The Sword of Kahless
Worf and Jadzie set out with the legendary Kor to find the ancient bat'leth of Kahless.