4-09: Our Man Bashir
A transporter mishap converts several crewmembers into spy-themed holosuite characters, with their true memories erased and their lives linked directly to the program.
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.
4-21: For The Cause
Sisko's loyalties are tested when his girlfriend, Kassidy Yates, is an accused Maquis collaborator.
4-02: The Way of the Warrior, Part II
DS9 is center ground as the Klingon conflict intensifies. Gowron tries to persuade Worf and the Defiant rescues a Cardassian convey carrying Gul Dukat.