Shadowfax

Shadowfax is a horse and one of the supporting

characters in Peter Jackson's The Lord of the Rings. He is one of the Mearas horses, and one of the most aggressive horses ever until Gandalf tamed him. He and Gandalf maintained an everlasting friendship.

The Two Towers
Shadowfax became the steed of Gandalf, travelling with him to Rohan, as well as gaining the allies of Gimli, Legolas, and Aragorn. They travel to Rohan, where the king is unwell after being poisoned by Saruman due to unknown reasons. After Gandalf heals Théoden and the burial of Théodred, the white wizard mounts upon Shadowfax to search for the King of Rohan's nephew, Prince Éomer, and the Rohirrim for reinforcements. He tells Aragorn to look for his and Shadowfax's return on the dawn of the fifth day. Five days later, during the Battle of Helm's Deep, Gandalf and Shadowfax return with Éomwr and his conpany. Shadowfax makes their arrival known by going on his hind legs and whinning. They ride down towards the battlefield and are victorious.

The Return of the King
After the battle is won, Gandalf rides on Shadowfax again to confront Saruman in Isengard, where the company is reunited with Merry and Pippin.Shadowfax is present when Saruman attemtps to kill him and Gandalf until the latter easily overpowers the former White Wizard. Shadowfax later was ridden by Gandalf and Pippin when they travel to Minas Tirith and assits them in helping the forces of Minas Tirith reach from Osgiliath to the city.