Origin
Lt. James Murphy was equipped with a symbiote which was separated from Hybrid. He is part of Mercury Team.
Creation
James Murphy was created by Zeb Wells and Clayton Crain.
Major Story Arcs
Carnage USA
Lt. Murphy debuted in Carnage USA as part of Mercury Team. He uses the symbiote known as Agony as a weapon and is able to carry a large rail gun as his symbiote disperses all the weight into the ground. He is sent after Carnage when he abducts the entire town of Doverton, Colorado.
Deadpool vs. Carnage
Mercury team was slaughtered by Carnage, and the symbiotes used the dog to transfer themselves to Deadpool.