Located in the Adirondack Mountains of Upstate New York, Doctor Doom used this fortress as a base for his activities in North America. It was surrounded by a moat with live crocodiles and believed to be booby-trapped. Doom built his first Time Platform there, which he used to send Mister Fanastic, the Human Torch, and the Thing back to the year 1716 to find Blackbeard's treasure chest and the Stones of Merlin. After this scheme ended in failure, Doom abandoned his castle.
Later, Doctor Doom imprisoned Mister Fantastic there after exchanging bodies with him in his plan to convince the rest of the Fantastic Four that he was Reed Richards in order to destroy them. Later still, Doom's Time Platform was removed to the Baxter Building.
Sometime after Doom vacated the castle, it was inhabited by Toad, who was attempting to make a career for himself as a solo criminal. With financial backing from Arcade, Toad outfitted the castle with death traps and killer robots, which he set on Angel and the Thing. Following his defeat, Toad suffered an emotional breakdown, but Angel offered to help him go straight by buying the castle and turning it into a medieval-themed amusement park called Toadworld, managed by Toad himself.
Toadworld proved successful, until a mysterious party bought the castle out from under Toad and forced him out: none other than Doctor Doom himself, who restored it back to its original function. With Arcade's help, Doom captured the X-Men and held them in various death traps in the castle, but each of them broke free. The castle was almost destroyed by Storm when her powers went out of control, but was saved when she brought them under control again.
The Avengers brought Doom's Time Platform and their alternate counterparts back to Doom's stateside castle in order to repair the device and return history back to normal. As the Scarlet Centurion appeared to reveal the whole ordeal was actually orchestrated by him to take over the Earth-689, Goliath shrank down to Ant-Man size and activated the time machine, sending the Centurion into the far future, and the Avengers back to their own version of history. The Watcher appeared and explained to the leader that the Scarlet Centurion was formally known as the time traveler Rama Tut, and after his meeting with Doctor Doom, became the Centurion. Having defeated the Centurion, the Avengers sent him to the year 4,000, where he would become Kang the Conqueror.
- Not to be confused with Doctor Doom's Castle in Doomstadt, Latveria or the Latverian Embassy in Manhattan.
- 19 appearance(s) of Castle Doom (Upstate New York)
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