Sleipnir

Sleipnir is Odin 's Horse.

Thor
Sleipnir has got eight legs and an unnatural speed, which makes him the quickest horse of all nine realms, able to reach the speed of light. He's totally loyal to Odin, his master.

Sleipnir is Odin 's destrier, his faithful steed, which accompanies him in his battles.

Odin deploys Sleipnir to quickly reach Jotunheim, where his son and his other asgardian friends are about to be killed by the Frost Giants.

Trivia

 * In the Norse mythology, Sleipnir is the son of Loki and Svaðilfari (with Loki as the mother).