The Tok'ra: Part 2 (S02E12)

The Tok'ra have turned down Col. Jack O'Neill and SG-1's request for an alliance against the Goa'uld because, as Garshaw explains, the earthlings don't offer enough rewards to justify the security breach. The fact that none of the humans will volunteer to serve as the host for Selmak, a Tok'ra whose current host is dying, further undermines the Tok'ra's trust. Capt. Samantha Carter has an idea: Her father, Gen. Jacob Carter, is dying of cancer. If he will become a host, it will save both his life and that of Selmak. But when she and O'Neill return to the stargate to propose the idea to her father, the Goa'uld, tipped off by a spy, launch an attack on the Tok'ra. The Tok'ra have enough warning to relocate, but by the time O'Neill, Carter and her father return to P34-353J, the attack is underway. The bonding of two beings as sick as Gen. Carter and Selmak would be difficult under the best of circumstances, but with Goa'uld death gliders filling the sky, both their lives are placed at risk as their joining is initiated.... (Metro-Goldwyn-Mayer (MGM))