|Leader(s)||Kenichio Harada (Silver Samurai)|
|Known Members||see below|
Hydra was a terrorist organization partially responsible for the creation of the Master Mold and Sentinel robots alongside William Stryker. Under orders of their leader, Silver Samurai, Hydra infiltrated Stryker's base to remove all evidence and Sentinel equipment, and by accident, activated the Master Mold.
- William Stryker (deceased)
- X-Men (formerly)