Second Skin, DS9 3
DS9 goes into the WTF mode with a highly Philip K. Dick-inspired story. Kira is kidnapped by Cardassians and awakens to find herself…one of them? Hw-hwhat?!?!?
The story is that she is not Kira Nerys, Bajoran freedom fighter, but actually a deep cover Cardassian agent who agreed to have her memory wiped for heavy infiltration. And all her memories are implants, etc.
Further twists occur when we discover that this new Nerys’ “father” is actually a Cardassian dissident. Things go around in circles a few times til we wind up where we started, but not without a good load of fun along the way.