The HYDRA Parasits were created after Johann Schmidt harnessed the Tesseract in 1942. When HYDRA's super bomber, the Valkyrie, was finally finished, the bombs were stored on board the plane. With them, Schmidt intended to launch a surprise attack on the United States of America by bombing heavily populated cities across the country.
When the United States Army attacked Schmidt's base in 1945, he flew away in the Valkyrie, intent on enacting his plan. However, the plane was boarded by the Allied Super Soldier Captain America, who decided to stop Schmidt. The plane eventually crashed into icy waters of North Atlantic, destroying the majority of the bombs.
The Parasits were carried in groups of eight aboard HYDRA's gigantic super bomber, the Valkyrie. All of them were controlled by a single suicide pilot.
- The HYDRA Parasit's design is based on three German aircraft: the Messerschmitt Me 334, the Fieseler Fi 103R Reichenberg, and the Messerschmitt Me 328.