Colonel Cameron Mitchell, Beau Bridges as Major General Hank Landry, and Lexa Doig as Dr. Carolyn Lam.
Teal'c is on the planet Dakara, the capital of the Free Jaffa Nation, the aftermath of the fall of the Goa'uld Empire at the end of season eight.
Arriving there on the Prometheus, they transport into a hidden cavern where a hologram of Merlin tells them that only the true will gain access to the treasures of the Ancients.
Trapped along with Teal'c and Vala Mal Doran far beneath England's Glastonbury Tor, Daniel Jackson and Cameron Mitchell have only seconds to outwit the Ancient snares in which they're caught.
Once they succeed, they have to handle only one or two more small details – such as a near-impossible sword fight with an inhuman knight – before they win access to the cave's vast treasure.
Already developing a keen sense of how things work at the SGC, Mitchell deduces that this is a bad sign and puts the two under medical supervision.
Similarly worried, Teal'c skips a critical meeting of the new Jaffa High Council to stay by his friend Daniel's side.
Before long, Vala ends up chained to a sacrificial altar, about to be burned to death by the village's Administrator and his fanatical followers.
"Avalon (Part 2)" is the first episode of the series to prominently feature only two members of the original cast: Michael Shanks (Daniel Jackson) and Christopher Judge (Teal'c).
Richard Dean Anderson had left the main cast after Season 8 in order to spend more time with his young daughter in Los Angeles.
[1] Despite being listed in the cast credits, Amanda Tapping as Samantha Carter only appears once in a video conference, as she was in the last stages of pregnancy at that time and in one other scene.
Matthew Walker guest-starred as the hologram of Merlin, and previously portrayed another Ancient named Moros in the Stargate Atlantis episode "Before I Sleep".
Stephen Graves said in a TV Zone review that Mitchell's introduction in this two-part episode was entertaining enough to distract what was deemed "a little too reminiscent of the production team's own efforts to turn around the season eight finale".