Alternate RealitiesAlthough Lorne was never one of the main characters of Stargate SG-1 or Stargate Atlantis, we were still given several glimpses of him in alternate realities.
SG-1 10x13 - The Road Not Taken
In a reality where the Stargate programme was forced to go public and the SGC never travelled to the Pegasus Galaxy or Atlantis, Lorne is the leader of SG-1.
SGA 04x20 - The Last Man
The presumed death of Sheppard and subsequent failure to rescue Teyla from Michael sent an alternate Pegasus galaxy spiralling out of control. In this reality, Lorne has been promoted to General and is the commanding officer of the entire SGC. When approached by Rodney McKay who is attempting to alter the timeline, he helps as best he can.