"Stargate: Atlantis" The Defiant One (TV Episode 2004) - IMDb
The team finds that a single Wraith survivor has remained alive for millennia by entering hibernation and periodically feeding on the ship's cargo of hibernating humans. This "Defiant One" is significantly stronger than typical Wraith due to its desperate survival tactics and is eventually able to seize control of the team's Puddle Jumper . [S1E12] The Defiant One
You can find more detailed credits and episode synopses on platforms like IMDb or the SGCommand Wiki. "Stargate: Atlantis" The Defiant One (TV Episode 2004)