The Black Sun

In Wolfenstein (2009) the Black Sun is not an organisation but a dimension. Sergei Kovlov teaches Blazkowicz to use the Thule Medallion and gives him a crystal that lets him enter the Veil, the barrier between Earth and the Black Sun dimension. The Nazis, who are excavating Isenstadt for the Nachtsonne crystals that power the medallion, want to harness the Black Sun's energy to turn the war against the Allies. General Zetta is revealed as a monster when seen through the Veil and is killed by Blazkowicz. A superweapon powered by Black Sun energy is later readied aboard a zeppelin over Isenstadt; Deathshead and Hans Grosse enter the Black Sun dimension, Blazkowicz follows and destroys the machine, and the explosion closes every access point to the dimension as the zeppelin falls onto the castle.