Episode 18: Shades Of Grey
On a mission to Tollana, O'Neill steals a weapon and takes it back to Earth. When Hammond discovers the deception, he suspends O'Neill. But O'Neill's misconduct is only the beginning of a mystery that could have catastrophic consequences.
Episode 19: New Ground
SG-1 journeys to a planet where their arrival ignites a war between two cultures. A powerful spy realizes his side could win the war if SG-1 and the Stargate can be neutralized. Will O'Neil and his team make the same realization and save themselves in time?
Episode 20: Maternal Instinct
Bra'tac arrives at Stargate Command with a wild story about interplanetary warfare with Apophis. Daniel deduces that the battle is over Apophis' child, Harsesis, and races to save the child before Apophis finds him first.
Episode 21: Crystal Skull
Daniel finds a glowing crystal skull identical to one first discovered by his grandfather decades before. When Daniel stares into the skull's eyes, a mysterious force makes him disappear. Now SG-1 must find Daniel's grandfather to unlock the mystery of the skull and bring Daniel back.
Episode 22: Nemesis
O'Neill is kidnapped by the Asgard and taken aboard a ship, where he encounters a swarm of metallic, bug-like creatures on a mission to destroy Earth. O'Neill plans to blow up the ship and sacrifice himself, but can the Stargate team find another way to stop this apocalyptic scheme?