|Dates||???? - 2018 (killed by Gabriel)|
|Episode(s)||13.20 Unfinished Business|
Sleipnir was a son of Loki, and close friends with Gabriel, having offered him asylum with his brothers in Monte Carlo when Gabriel faked his death. When the Apocalypse was looming, and it appeared that Lucifer would be victorious, Sleipnir, along with his brothers Fenrir Odensbane and Narfi, bound and kidnapped Gabriel on orders of his father and sold him off to the Prince of Hell Asmodeus.
Despite his age, Sleipnir does not appear to be particularly powerful. In a fight with Dean, after Dean disarms him, he is easily thrown to the ground. Unlike most pagan gods, he does not display any extraordinary powers of his own. His real form is a horse, as his occasionally-glimpsed "demigod face" shows. Sleipnir also shows a weakness to silver, as a silver bullet to the right shoulder was able to wound him. Like most pagan gods, Sleipnir can be killed by a specially-crafted wooden sword through the heart.
Finding Fenrir's body with Narfi, Sleipnir remarks that Fenrir died as he lived, next to a bottle, before pointing out to Narfi that Fenrir got a few good hits in before dying. When Narfi examines the blood and realizes it is from an archangel, Sleipnir immediately calls their father. Tracking Gabriel to the Winchesters' motel, Sleipnir and Narfi enter the room and begin fighting the Winchesters, getting the upper hand until Gabriel drives a wooden sword through Narfi, prompting Sleipnir to make a hasty exit.
Returning to Loki's penthouse, Sleipnir realizes that the Winchesters and Gabriel have found them and orders the guards to kill them. In the the shoot out, Sleipnir is hit in the shoulder with a silver bullet, injuring him. As he lays prone on the floor, he begs Gabriel for mercy. Gabriel drives a wooden sword into Sleipnir's heart, killing him.
Sleipnir in Lore
In Norse mythology, Sleipnir (Old Norse for "Slippy") is the gray eight-legged horse of Odin, and the child of Loki and the stallion Svaðilfari. Sleipnir is described as "the best horse among gods and men."