When SG-1 found Anubis' Ha'tak in orbit over Earth, they inadvertently freed a group of Ninja Jaffa by opening a sealed compartment. The Jaffa proceeded to kill Dr. Friesen and injure Jacob Carter before being stopped by Teal'c and Jonas Quinn. (SG1: "Descent") When Anubis attacked Abydos, two Ninja Jaffa were present when Her'ak was negotiating with Colonel Jack O'Neill. When Anubis attacked Kelowna, two Ninja Jaffa were present with Anubis at all times. (SG1: "Full Circle", "Fallen", "Homecoming")