Stargate: Atlantis Episode 5.03 Broken Ties

Ronon is ambushed during an off-world mission and awakens, much later, a prisoner of his former friend, Tyre. The fellow Satedan, it turns out, has fallen on hard times since they last crossed paths. Abandoned by the Wraith he once served, he is undergoing a physiological and psychological withdrawal from the reverse-feeding process once granted to him as a Wraith worshiper. But he believes he has come up with a way to win back the respect of his former masters. He'll deliver them Ronon.

Intent on turning their defiant captive, the Wraith begin their process of reverse-feeding, stealing Ronon's life, bringing him to the brink of death, then restoring his youth. Again and again, and again.

A tip, meanwhile, leads the team to an abandoned village. But Ronon and the Wraith are long gone, and the only remnant of their presence is a seriously injured Tyre who may be their only hope of rescuing their friend.