Jotunheim

"Thor, it's madness!" "Madness? What sort of madness?" "We're going to Jotunheim."

- Loki, Volstagg, and Thor

Jotunheim is one of the Nine Realms and the home of the Frost Giants. It was ruled by Laufey.

History
In 965 A.D. the Frost Giants and the Asgardians fought the last battle of the war there. After the battle, Odin took the Casket of Ancient Winters, and Laufey's son, who was left to die.

In 2011, Thor and his friends came there for some answers on their recent break-in to Asgard. The Asgardians encountered a fight, where they fought a seemingly endless army of Frost Giants along with an enormous beast. Odin came to rescue his subjects, and returned them to Asgard.

Loki later takes a visit to Jotunheim to strike a deal with Laufey. He would allow Laufey to go to Asgard to kill Odin. That way, Laufey's worst enemy would be killed and Loki would take the throne. However, Loki betrays and kills Laufey, his father. He then overloads the Bifrost Bridge's power in order to destroy the monster-full Jotunheim. However, Thor destroys the Bifrost Bridge before the realm could be destroyed.

In 2013, during the Convergence, a portal opens up to Jotunheim allowing a native beast to ecape into London.