The Hive (HYDRA)

 The Hive was a former HYDRA agent that was selected for a special program at the HYDRA Recruitment Center in Vancouver called Ravenous. Kraken would take this agent to a secret underwater base called the Hive and place him in a room filled with parasitic pods. The Kraken tells Baron Von Strucker that this agent was flagged during his physical because he had a deficient white blood cell count and his body would less likely reject the process. The pods began to open and the parasites attached themselves to the agent's nude body. The process was extremely painful but the HYDRA agent became the perfect host body and was transformed into a mutated human/parasite hybrid. The Hive was born and it was able to gain complete control of the parasites as it evolved and effectively form a group consciousness. (1)