Cooper made his directorial debut with "Crusade" a ninth season episode of Stargate SG-1. In the 10th season premiere episode "Flesh and Blood", Cooper's daughter Emma played the 4 year old Adria. Later in the tenth season of Stargate SG-1, in early scenes of the episode "Talion", his older daughter Megan Elizabeth Cooper played a jaffa girl. Cooper also directed "Unending" the final episode of Stargate SG-1. Following the conclusion of SG-1, Cooper wrote and directed the direct-to-DVD movie Stargate: The Ark of Truth.