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.
4-07: Little Green Men
Quark, Rom, and Nog accidentally transport themselves back to the Roswell Incident on Earth in 1947.