Sylvester Asimov was a Russian soldier who joined the Annex Project in order to protect his daughter from the dangerous A.E. Virus, which threatened Earth's population.
Even without the use of the drug, Sylvester possesses the strength & skill to kill a Terraformar with his bare fists. He is skilled in Judo.
Sylvester is an officer and is considered to be one of the strongest members of the Annex I. After receiving his M.O. Operation Sylvester gained the powers and abilities of the Tasmanian King Crab, giving him incredible strength and durability which allows him to endure heavy hits from the roaches without suffering damage and crush them easily. Moreover, he is able to eventually regenerate any lost limbs after few minutes with little effort.