The Second Alpha Site was a planet in the Milky Way galaxy which was used as the Tau'ri's second Alpha Site when their old one was compromised by Anubis. This base was also forced to be abandoned when Kull warriors attacked the planet. It was under the command of Colonel Riley and his second in command Major Green. To prevent the Kull warriors from finding the sensitive materials on the base, Riley detonated the self-destruct and destroyed the base. (SG1: "Death Knell")