The episode opens with Daniel Jackson confined to the infirmary recovering from an appendectomy. The rest of team is told to take a vacation, but before they can go, O'Neill is suddenly transported to Thor's ship where he is informed that the enemy the Asgard deemed greater than the Goa'uld is onboard, and Thor needs Jack's help to defeat them.

While visiting a new world, the team discovers a skull fashioned from pink crystal, that Daniel cannot resist looking into - at which point he disappears. Unable to locate Dr Jackson, SG-1 return to Earth hoping to find a way to retrieve their lost friend.

SG-1 journeys to Kheb to locate the Harcesis child.

SG-1 discovers a planet on which two locals just discovered the Stargate that had been buried for thousands of years. Unfortunately, the authorities soon come and the military comes after the team, who think they are enemy spies and don't believe a word they say.

When the Tollan refuse to share technology, even after SG-1 saved the planet from a Goa'uld attack, Jack gets angry and steals a device from them. As a result, Jack is forced into early retirement.

During an expedition to a civilized planet, the Stargate of that world is hit by a meteor, trapping O'Neill on that world without any apparent hope of rescue.

SG-1 travels to a paradisical-appearing planet... only to step immediately back out of the Stargate with no memory of their trip. They soon find themselves engaging in odd behavior, and find out that a computer chip has been planted in their minds during their memory blackout.

The Tollan inform the SGC that Klor'el/Ska'ara have crash-landed on their planet and that they will hold a trial to determine which has the right to Ska'ara's body. SG-1 is invited to Tollan to act as his defense.

When SG-1 returns from a mission, everyone at the SGC is acting strangely.

SG-1's plan to escape has failed and Apophis has returned. They must find a new way off the planet before it is too late.

The Tok'ra come to Earth and tell Sam that her dad has been captured and is being held prisoner by Sokar on a planet Earth people would describe as hell. Martouf informs them that Jolinar has escaped from this place once before, so it is up to Sam to remember how.

SG-1 travels to a planet whose inhabitants seem to be suffering from mass retrograde amnesia.

In the middle of a battlefield Daniel and Amonet meet in a tent. Amonet uses her hand device on Daniel, and when he awakes Amonet (and Sha're) are dead, but when he returns to Earth, he keeps seeing her everywhere.

Upon exiting the Stargate, SG-1 finds itself in the midst of battle. A group of SG soldiers battle a Jaffa army. Believing the soldiers to be the missing-in-action SG-11 team, O'Neill and the others provide assistance. Much to their surprise, the mystery SG team turns their weapons on SG-1.

SG-1 stumbles on a village that is about to sacrifice a young woman to the demon that plagues their village for being possessed. When the village leader discovers SG-1, their lives are threatened as he believes them also to be possessed, and they must fight for their lives.

The team are captured by a bounty hunter who plans to use them to capture a Goa'uld, but all is not as it seems.

Alternate reality versions of Carter and Kawalsky use the quantum mirror to arrive at a secured building in the top secret Area 51 in "our" universe. When the alternate Carter begins to feel the effects of temporal distortion, SGC must come up with a plan to send the alternates back and help them defeat their Apophis.

SG-1 visits a planet, Orban, where some children are the experts in their fields of knowledge. SG-1 finds this strange despite the Orbanians telling them it is normal; when they investigate some more, they find that all is not well on Orban.

Daniel starts going crazy after SG-1 visits a planet where SG-1 found nine dead Goa'uld. The doctors believe he is suffering from the effects of traveling through the gate.

The Asgard wish to include Earth in their protected planets treaty with the Goa'uld, which will save them from an attack. The negotiations are to take place at the SGC.

The Tok'ra believe that the ancient Goa'uld System Lord, Seth, is hiding on Earth posing as a religious leader. SG-1 and the Tok'ra Selmak must find him without falling victim to his brainwashing powers.

General Hammond leads a daring rescue attempt with the help of Teal'c to retrieve SG-1. Meanwhile, on board the Goa'uld ship, one of the members of the team gets a present from Hathor... is it too late to save Colonel O'Neill?