The "Earth-TRN999" used on this page is an unofficial Temporary Reality Number that was assigned by our wiki until an official designation is provided by Marvel.
History
The Sleeper was discovered during the Middle Ages by the third Baron Zemo, Heller Zemo. Though they couldn't understand what the Sleeper was, Zemo and his men realized it is something important. Castle Zemo was soon built around the Sleeper's resting place.
Hundreds of years later, during World War II, the Castle was owned by Baron Heinrich Zemo, who thought that he was destined to awake the Sleeper and use it to help him in his world conquest; however, he unwisely made an alliance with Johann Schmidt, commander of the Nazi research division, Hydra. On Schmidt's orders, the soldiers of Hydra occupied Castle Zemo, where Schmidt's top scientist Arnim Zola studied the Sleeper.
In 1944, the castle was infiltrated by the American Super Soldier, Captain America. After he defeated the guards, he confronted Zola's robot, while the Sleeper awoke and destroyed one Allied plane; however, the Sleeper was in turn destroyed by Captain America.[1]