Avalon (Stargate SG-1)

Lieutenant Colonel Cameron Mitchell is at Stargate Command (SGC) staring at the Stargate for the first time. He piloted an F-302 in the defense of Earth against the attack fleet of Anubis at the climax of season seven ("Lost City"). After his efforts and recovery from his injuries, Jack O'Neill offered him any job he liked, and he wished to join SG-1. However, when he arrives at the base, he finds that SG-1 has been disbanded, a new general is in control, and he is set to pick and lead the new team. The new general is Hank Landry, a friend of both George Hammond and O'Neill. Under his order, Mitchell begins the selection process for new members of SG-1, but can't stomach any of the "terrible candidates". He wanted to work with the best, and he's determined to get SG-1 back together.

Teal'c is off on the planet Dakara, which has been established as the capital of the newly founded Free Jaffa Nation, the aftermath of the fall of the Goa'uld Empire at the end of season eight. Samantha Carter has been moved to Area 51, where she is aiding in research and development. O'Neill has been promoted out of the SGC (hence the new general), and Daniel Jackson is set to take a ride on board the Daedalus, to Atlantis, the now-found City of the Ancients.

An unscheduled off-world activation admits to the SGC a character not seen since season eight - Vala Mal Doran - claiming to have something they want. They let her in and she immediately seeks out her "friend" Daniel to pester. She's got a tablet written in Ancient that leads to a trove of hidden Ancient treasures, and she needs Daniel to translate it. However, as soon as they are close together, she throws a pair of cuffs onto both his and her wrists. These are kor mak bracelets (Teal'c explains, on his return), which link the two of them together such that they cannot be greatly separated without feeling pain and eventually death. Thus Vala ensures that Daniel does what she says.

This, of course, causes Daniel to miss his trip on the Daedalus to Atlantis, meaning that he won't make his much-desired trip there. Meanwhile, however, he translates the tablet and who wrote it: an Ancient fleeing Atlantis after the war with the Wraith, named Myrddin, who Daniel says is Merlin, the wizard associated with King Arthur and his Knights of the Round Table. After further research, Daniel concludes that the treasure is located beneath Glastonbury Tor in England.

Arriving at the place on the Prometheus, they ring inside a hidden cavern where a hologram of Merlin tells them that only the true will gain access to the treasures of the Ancients. There is a sword in a stone, but Mitchell is unable to remove it. They decide to explore further; Daniel and Vala take a right passageway, and Mitchell and Teal'c take a left. Both parties find rooms which light up upon entry. In both rooms, the parties encounter puzzles, and the doors lock shut automatically. Just when they think it can't get any worse, the ceiling begins to lower to crush them, and they must solve the puzzles in time before they are crushed.

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. Amid the standard-issue gold and jewels, Daniel uncovers a horde of books apparently written by the Ancients. They tell a fantastic tale: The highly advanced Ancients may have once called themselves the Altera, and may have evolved in a far distant galaxy. The crew excavating the treasure also finds a piece of Ancient equipment, which Daniel believes is a communications device. Daniel persuades Mitchell and Hank Landry to let him test the machine.

Within seconds, he and Vala – whose lives are still bound to one another by the Jaffa bracelets – drop to the ground, unconscious. Already developing a keen sense of how things work at Stargate Command, 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.

Meanwhile, Daniel and Vala find themselves inhabiting the bodies of two married villagers on a distant planet. Being married to Vala – in even the remotest possible sense – gives Daniel the creeps, even before he learns that the villagers are devout worshippers of all-powerful and unforgiving beings called the Ori. What's worse, the two people whose bodies Daniel and Vala are inhabiting are suspected of heresy against these mysterious gods.

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. Restrained by the vehement villagers, there's nothing Daniel can do but watch in horror as the flames are lit. Back on Earth, Mitchell and the others are watching, too, as Vala slips toward death. As Daniel holds Vala's charred body, a man in robes, holding an ornate staff, approaches the altar. The staff begins to glow, and Daniel watches in amazement as he brings Vala back to life. Daniel thanks him, but he responds, "Thank the Ori". He then tells them to follow him out of the square, and they follow.