Damon Ryder was a scientist at Portalnd, where he met Ben Reilly (the clone of Spider-Man (Peter Parker)) while he was in his exile, and hired him as his assistant, but also they became friends. Ryder was experimenting with dinosaur DNA, wanting to gain super-human powers. For this, Damon injected himself with the serum he created. One of the first signs appeared when Damon grown a giant jaw with sharped theets. After noticing what he has done, Reilly tired to convince Damon to go to a hospital. At that moment Kaine appeared to kill Reilly, after searching for him many months. The fight started a fire and Reilly instructed Damon to het his wife and son out of his house, he failed at it and they died.
This loose drove Damon insane and he swore revenge on Ben, who would die years later at the hands of the Green Goblin saving his genetic template, Spider-Man. However, Damon found Peter Parker, believing that Ben changed his name after the tragedy. Now under the name of Raptor, Damon attacked Peter at a reunion of the Reilly family, but "was saved" by Spider-Man. Ryder then appeared in New York City and confronted Peter, still believing him to be Ben Reilly and repeatedly calling him "Ben". The two fought in the middle of the office of Frontline after Raptor threatened to target Peter's family. Ryder gained the upperhand before Peter's coworkers got in the way, then left after handing over the article on the arsonist, with Ben Urich noting that it appeared to be Peter in the sketch. Ryder ditched his jacket not knowing a spider-tracer was on it, and headed to Peter's apartment to seemingly attack his roommate. When Spider-Man reached the tagged jacket, he was attacked by Kaine.[1] After a scuffle with Kaine, Peter returned to his apartment and found his roommate unharmed, though she gave him the address of Aunt May's home. Peter headed there, only to find Raptor holding Harry Osborn and his cousins hostage at gunpoint. As Raptor announced his plans to burn his friends and family to death right in front of him after he admited his "true identity" as Ben Reilly, Kaine arrived, revealing that he had been working with Raptor. Kaine exposed both Peter's identity and his status as a "clone" of Reilly to Raptor, encouraging him to kill him, since if Reilly was a murderer, then Peter could be driven to kill as well. Refusing to accept this, Peter beat Raptor unconscious, while affirming his and Reilly's innocence and the fact that they would never murder anyone. He was forced to flee when the police arrived, so Kaine and Raptor escaped.[2]
At his hideout, Raptor is killed by Kaine, who felt betrayed when Damon denied cure him from his cellular degeneration, claiming that Kaine lead him to the wrong person.