He also made a cameo appearance as a writer for Wormhole X-Treme! in the episode of the same name. In "Flesh and Blood", he had his daughter Emma Rose play the four year-old version of the Orici, Adria, and in "Talion", he had his older daughter Megan Elizabeth Cooper play a young Jaffa female. In addition to writing numerous episodes for Stargate SG-1, Stargate Atlantis and Stargate Universe, Cooper has also gone on to direct episodes of all three, making his directional debut with the Stargate SG-1 Season 9 episode, Crusade.