Season 4 Episode 17 - Absolute Power

Daniel recovers Apophis's son, the Harcesis. He has the memories of all the Gou'ald, which SG Command wants to obtain so that they can defeat their enemies. Daniel is given all the knowledge, but soon begins to use it in a tyrannical fashion as he usurps authority to build a ring of killer satellites capable of repelling the Gou'ald around Earth. Soon, only Jack can get close enough to stop him before Daniel completely takes over the world in the name of peace.