The Tollan offer Earth advanced weapons technology, prompting a secret investigation on Tollana — one that leads to a startling discovery.

O’Neill steals technology from the Tollan, and is forced to leave the Stargate program. Maybourne offers an intriguing proposal.

The Tollan put Skaara and Klorel on trial to determine who will control the host body.

A link to the four witches Sabbaths is found after a doctor loses control and kills a patient on the operating table, and Mulder suspects a nurse may be practicing…