4-25: Broken Link
When Odo is struck with an unknown illness, Sisko seeks help from The Founders, who enact a punishment against Odo for harming another Changeling.
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.
4-11: Paradise Lost
Paranoia swarms as Sisko and Odo work to prevent a military power-grab at Starfleet Command, while the Defiant is believed to have been overtaken by Changelings.