Season 7 Episode 04 - Orpheus

SG-1 arrives at SGC under enemy fire and a wounded Teal'c collapses – his recovery is slow in the absence of his symbiote and he doesn't take it well. Meanwhile Daniel starts to have a nagging memory-echo of an incoming wormhole. Teal'c refuses to go back on duty, believing the use of the drug is weakening him. While meditating Daniel finally remembers a prison planet where he saw Bra'tac and Rya'c and Teal'c tells Daniel about when he appeared in Teal'c's dream (in The Changeling). They call in Rak'nor, who helps direct them to the proper planet, Erebus, where POWs are taken and forced to work to the death, and Bra'tac and Rya'c were accidentally captured while looking for rebels to join their cause, and Bra'tac is running out of tratonin.

From his time as an ascended being Daniel remembers the signal they need to get through the force field around Erebus' Stargate and the SG teams launch an attack. When it's dark Teal'c sneaks into the camp but Rya'c refuses to go without the other prisoners and Teal'c is captured. Jack and the others must wait while Teal'c is tortured. Daniel and Sam sneak onto the nearby pyramid ship and rig it to explode as a distraction but are trapped on the ship. Meanwhile Bra'tac shakes Teal'c out of his funk. When Rya'c is captured Teal'c offers himself just as the distraction goes off. Teal'c kills the camp commandant single-handedly, proving himself and finds himself able to achieve meditation even without his symbiote.