Star Trek: Deep Space Nine: 7x21

When It Rains...

Kira gets sent behind Cardassian lines in an effort to train them in resistance fighting. When Dr. Bashir learns of the deadly disease that Odo is infected with, he gets met with barriers when trying to obtain his medical records from Starfleet. And Martok gets blindsided by Gowron when he arrives on DS9, announcing that he has assumed command of the Klingon fleet.

Star Trek: Deep Space Nine: Season 7 Episode 21
1999