Maugrim

Maugrim (known by some records as Fenris Ulf) was a ferocious talking wolf and the head captain of the White Witch's Secret Police at the very end of the Long Winter. He was loyal to the White Witch.
 * "Be still, stranger, or you'll never move again!"
 * ―Maugrim, threatening Edmund.[src]

Biography
Maugrim first led the raid of Tumnus' Cave where the Faun Tumnus was captured and his home left in tatters. Here, Maugrim left a letter to warn and intimidate others passing by, making an example of Tumnus.

Maugrim encountered the human boy Edmund Pevensie while guarding the White Witch's Castle courtyard after Edmund mistook him to be a stone wolf.

He later spied on Aslan's Camp until being exposed by Susan Pevensie with the sound of her horn. Susan's oldest sibling, Peter, drew his sword and met Maugrim in battle while she fled into a tree. Although Peter at first missed Maugrim with his blade, while the wolf howled formidably, Peter successfully impaled Maugrim through the heart. The wolf captain died a few moments later, never ceasing his struggling.

Adaptations
He appeared in the BBC version of The Lion, The Witch, and the Wardrobe, where he was portrayed by Canadian Actor Martin Stone.

He also appeared in the 2005 Disney adaptation The Chronicles of Narnia, with an expanded role, where he and his Secret Police (portrayed to have a lot more members) attempt to intimidate the Red Fox into revealing the childrens' location. His death, although still by Peter's hand, was noticably different in the film, as, after taunting Peter about his being a coward (referring to an earlier encounter where Peter was unwilling to deliver a killing blow without risking his friends), he jumps right onto Peter's swordtip while the sword was extended at the wolf, indicating that he either became extremely arrogant to the point that even Peter pointing his sword directly at Maugrim was of little concern to him, or he was attempting suicide.

Trivia

 * When given the opportunity to make changes to the texts for publishing the book in US territories, Lewis (amongst other revisions in the book) changed his name to Fenris Ulf (and therefore also Peter's title to "Fenris Bane") after which these changes were reflected in American editions of the books. Even though Lewis may had a good reason to change the name, the current Narnia publisher, HarperCollins, in 1994 decided to use Lewis' earlier, unrevised texts to publish today (and also re-order the books so they reflect internal chronology; a change which is also disputed), which refer to him as "Maugrim". This decision has led to the character now being most widely known as "Maugrim", even though many consider his canonical name to be Fenris Ulf.
 * Maugrim's name is supposedly derived from the words "maw" (mouth) and "grim" or possibly "morgue grim".
 * Maugrim appears in the 2005 motion picture The Chronicles of Narnia: The Lion, the Witch and the Wardrobe, in which he is voiced by American actor Michael Madsen.