Easy Company is introduced to Captain Sobel, who has the group undergo hard and unfair training. As a result, Sobel comes into conflict with his men, including Richard Winters, his executive officer. The company is shipped to England to prepare for D-Day.
An alien ship approaches Earth, sending SG-1 to an old friend for some answers — where they discover that Martin Lloyd has created a TV show about the Stargate program.
When Carter goes missing, O’Neill teams up with Col. Maybourne again to free her.
SG-1 encounters a potential new, technologically advanced ally in the war against the Goa’uld — though they do not know the Aschen’s dark secret.
The Tollan offer Earth advanced weapons technology, prompting a secret investigation on Tollana — one that leads to a startling discovery.
SG-1 teams with a Russian unit when one of their Stargate teams goes missing in a mysterious alien ziggurat.
SG-1 discovers a civilization that uses Unas as slave labor, and attempt to liberate Daniel’s friend, Chaka.
Cassandra mysteriously falls ill, sending SG-1 back to her home planet — where they uncover a dark Goa’uld secret.
SG-1 discovers that their recent trip through the Stargate may have inadvertently doomed an entire civilization.
O’Neill and Lieutenant Tyler are ambushed by Goa’uld forces and trapped behind enemy lines — while the rest of their team discover they don’t know who Tyler is.