Hellboy: 20 Easter Eggs And References Explained
13. Project Ragna Rok
Project Ragna Rok is the codename for the Nazi experiment to create a Doomsday weapon, which in the comics resulted in Rasputin summoning Hellboy from the underworld to Earth.
Although the Nazis responsible are not shown in the film after the downfall of the project - as the figures of Leopold Kurtz, Ilsa Haupstein, and Karl Kroenen don't feature in the film - the concept itself remains loyal to its original comic interpretation.