Former commander of SG-3.
Colonel Makepeace was caught assisting in the theft of alien technology, and was arrested along with the members of the off-world Tauri team that he was assisting. This was the result of infiltration of the team by Colonel Jack O'Neill, in cooperation with General Hammond, the Asgard and the Tollan.
Character played by Steve Makaj.
Episode 3.18, Shades of Grey