Viper (G.I. Joe) - G.I. Joe: The Rise of Cobra

G.I. Joe: The Rise of Cobra

Neo-Vipers were Cobra troopers who were enhanced with nanomites by The Doctor. These enhancements removed their self-preservation instincts and their sense of pain, and made them completely obedient to Cobra.

The ranks of Cobra Vipers originally consisted mostly of mercenaries and criminals, however after the completion of all of Cobra's nano experimentation Neo-Vipers may have mostly consisted of kidnapped soldiers from around the world. 20 mercenaries were selected for the painful series of injections, and the ones who didn't die from their pain were turned into the ultimate super soldiers.

Each subject was injected with 1,000 CCs of Nanomite solution, which left a small scar in the shape of a small cobra's head (all nano injected members of Cobra bear this mark, including Baroness, Zartan, and much later Destro). After injection, specially designed nanomites both attack and rewire the subject's central nervous system, making the subject completely under the absolute control of their controller (the only exception to this was Zartan, who destroyed the neural controlling nanomites before he was injected).