The attempt to forge an alliance with the Tok'ra seems a miserable failure, as SG-1 is practically imprisoned as a security risk and considered virtually hostile because 'blending', by agreeing to host a symbiote, is a bridge too far for each of them. When SG-3 arrives and informs Sam about her terminally ill father General Jacob Carter's quickly worsening condition, she realizes the symbiote's healing powers, confirmed to apply to cancer, make hosting an offer to good to refuse for him. Garshaw allows Sam and Jack to return and convince both generals to allow the plan, which is achieved. Meanwhile, the Tok'ra must hastily evacuate, destroying tunnels behind them, because a large-scale attack by Apophis's troops is expected soon, while Jacob meets his potential symbiotic partner Selmak and his equally terminal predecessor to help him decide. Jack verifies his strong suspicion there is traitor among the Tok'ra who is communicating with the Goa'uld.