Stainor was a member of the human 9-man Resistance cell led by Colonel Mary Randall. They assaulted a fully functional Skynet network complex six months after John Connor destroyed the Master Control central node. Within this facility was an operational Time Displacement Chamber, greater in scope than the prototype discovered by John Connor. Their mission was to utilize the TDE to return to 1984 and eliminate Skynet by killing key individuals in the Cyberdyne Systems heirarchy.I825.M, observed the infiltration of the cell but did not interfere directly. After reporting the infiltration to the Processing Command Center of the facility he headed for the Incubation Chamber to activate defenders for the facility. Only 3 units were available for immediate activation; C890.L, C850.D, and HC875.S.
Stainor was the last of the three members of the team killed during the initial assault on the facility. His body was later identified by another 5-man Resistance cell under the command of Captain Emmer following up on Colonel Randall's mission.