In Neil Gaiman’s Norse Mythology, Fenrir is the wolf who swallows Odin at Ragnarök. Fenrir is one of the monstrous children of Loki and the giantess Angrboða.
The gods recognize Fenrir as a dangerous creature while he is still young. They bind him with the magical ribbon Gleipnir, which is made from impossible ingredients such as the sound of a cat’s footsteps and the roots of mountains. Fenrir bites off the hand of the god Týr during the binding.
At Ragnarök, Fenrir breaks free and advances against the gods. He kills and swallows Odin, but Odin’s son Víðarr later avenges him by tearing Fenrir apart. Gaiman retells this episode in accessible modern prose while preserving its mythic sequence.
Fenrir is sometimes confused with Sköll or Hati, wolves associated with pursuing the sun and moon rather than killing Odin.