The first Viper was Jordan Stryke but used the alias Jordan Dixon to help conceal  his costume identity. His brother Leopold Stryke was the Eel and both of them worked together as criminals for the group Crime Wave. The group Crime Wave came into conflict with Captain America and the Falcon and both brothers ended up in prison. Both brothers eventually escape and form the first Serpent Squad with King Cobra. The trio had numerous encounters with Captain America and the Falcon but were always defeated.
While in custody, he was being transported to stand trial before a grand jury by US Marshalls. His van was ambushed by Madame Hydra and the guards were killed. Jordon encountered Madame Hydra & she told him she wanted his name. Madame Hydra gunned down Jordon and killed him. She assumed the name Viper & became the new leader of the Serpent Squad.
A new Serpent Squad has appeared led by the Red Skull's daughter, Sin. The group also consist of Eel, Cobra and a new Viper whose identity is yet to be revealed. 

Powers & Abilities:
Viper has no superhuman abilities but he is a very intelligent individual and skilled fighter. He was skilled enough in chemistry to create his own venom. He wore venom-tipped claws and used venom-tipped darts as weapons.