"Didn't I-?" He scratches his head and grins sheepishly. "He's - he was the head scientist of Project Rebirth, the program I was recruited for. ...He was the doctor that Schmidt had killed."

The smile drops off his face and he looks at his hands. "His serum was misused by the Schmidt, Johann Schmidt, the head of Hydra. It changed him, kind of like it changed me - except t made him the Red Skull. It's what the Nazi soldiers who'd seen him, the ones who got out alive, who weren't part of Hydra? It's what they called him."