History
After the Carnage Symbiote attached itself to the Silver Surfer, Thor fought against him along with Spider-Man, Justice, Firestar and the other Avengers. During the fight, Thor quickly threw his hammer at the Carnage Cosmic, but the Carnage Cosmic wrapped the hammer in symbiotic webbing and transformed into a giant spike heading back to Thor's hand. Fortunately, Iron Man managed to use his repulsors to break the symbiotic webbing, returning the use of Thor's hammer. Before the Avengers could rally themselves, the Carnage Cosmic blasted them all to the ground and flew off to create for mayhem.
After returning to Avengers Mansion to tend to the Vision's injuries and discussing the events that led to the Carnage Symbiote bonding with the Sulver Surfer.
During the second battle with the Carnage Cosmic, Thor and the others were once again easily bested by the Carnage Cosmic. Firestar managed to harm the symbiote enough to allow the Silver Surfer control over his body. Realizing that there was only way to stop the Carnage symbiote, the Silver Surfer flew himself into the sun, destroying both himself and the symbiote.