Jolinar's Memories

The Tok'ra arrive at SGC with the news that Carter's father Jacob has been taken prisoner by Sokar. He is being held in Sokar's prison on a moon orbiting his home world. The only person known to have escaped from that prison is Jolinar and the Tok'ra hope that Sam's memories will provide the information they need to stage a successful rescue. While Sam manages to determine how Jolinar escaped, they are all taken aback when the first prime reveals his true identity. (imdb.com)