Captain America (1968) #256

"The Ghosts of Greymoor Castle"

While still in England, Captain America visits Greymoor Castle, the site of one of his greatest World War II battles. Once inside the castle, Cap discovers an old enemy, Cedric Rawlings, and the pit of Z-rays. Is Rawlings still the primary enemy within Greymoor Castle, or is there another menace lurking in the shadows?

Note: The continuation of these events are documented in the Vision and Scarlet Witch ltd series