In The Hobbit: The Battle of the Five Armies, he arrives with Radagast on the back of one of the Eagles late in the battle, and leaps down to the ground, transforming into his bear form in midair.
He becomes available after completing the Queer Lodgings chapter. Beorn's skin changing ability allows him to transform into a bear.
Beorn is a fictional character created by J. R. R. Tolkien, and part of his Middle-earth legendarium. He appears in The Hobbit as a "skin-changer", a man who could assume the form of a great black bear.
Beorn was a skin changer and the last of his kind. He had no love for Dwarves but hated Orcs and Goblins more. He lived in a cottage near the edge of Mirkwood and he had the ability to change into a bear.
It is therefore likely that when the Fourth Age of Middle Earth begins, and the immortal beings fade out of the world, Radagast disappears off into the East somewhere, forging a path for himself and his animals far away from the world of Men.
But Radagast was weaker and his role overshadowed by Gandalf's achievements. Therefore it is difficult to conclude whether or not Radagast failed. But it is clear that Tolkien had doubts following his criticism of him in the Istari essay and Radagast certainly did not fall into evil.
Radagast was very loyal to the cause in Middle-earth and became a friend of animals, even letting a family of birds live on top of his head. He also is very brave, as Radagast had went out to distract the Wargs and Orcs as Thorin and Company make their escape.
Initially, when looking at Beorn and Tom Bombadil, it is easy to see their differences. Beorn is a man, while Bombadil is not. Beorn is physically a very imposing figure, whereas Bombadil is comical in his appearance. Bombadil is married to Goldberry, and this marriage is a very important aspect of his existence.
While Gandalf knew him, Beorn did not know Gandalf; but he knew his fellow wizard, Radagast.
Known skinchangers
Arya Stark, who has wolf dreams with Nymeria and can see through the eyes of a cat. Bran Stark, who can enter his direwolf, Summer; a human, Hodor; a raven; and the weirwood at Winterfell. Rickon Stark, whose direwolf is Shaggydog.
Beorn and his descendants are the only skin-changers that we know about in any detail at all, and indeed it is conceivable that they were unique in Middle-earth. When Gandalf first mentioned Beorn to his companions, however, he described him with the words, 'he is a skin-changer' (The Hobbit 7, Queer Lodgings).
Beorn can take the form of a great black bear and has the great strength and durability expected in that form. He also has a miraculous effect on his animals, who seem to be more intelligent and strong than other animals when around him.
The movies decided to make Sauron the puppet master behind all events, from ordering Azog to kill the dwarves to attacking the armies of good with massive hoards of orcs in The Battle of the Five Armies.
How does Gandalf break a promise to Beorn? He won't return a borrowed horse.
How do we know Beorn liked the travelers? He gave them food and lodging, let them borrow his ponies, and lurked around them watching out for them on their way.
He is called skin-changer because he can change himself into a bear. Gandalf introduces himself and Bilbo to Beorn, who at first does not appear too friendly.
Tolkien wrote that Radagast eventually became too obsessed with the natural world, spending his days deep in the wild communing with animals and studying their ways. He became something of a recluse, which led him to stay out of the War of the Ring.
Radagast decides to use his magic on Sebastian, and when he finishes his incantation of the spell, the spiders return to the place from whence they came. Meanwhile, the spell has cured Sebastian, and he appears completely back to normal.
When Frodo shows Tom Bombadil the Ring, he amazes the Hobbits by putting the Ring on without disappearing. The reason that Tom Bombadil is not subject to the power of the Ring is that he really, truly does not desire power or ownership over any one thing.
Many Lord of the Rings fans also say Tom Bombadil is actually the most powerful character in all of Middle Earth, due to his apparent immortality, ability to completely resist the Ring, power over his domain, and knowledge that comes from living since the beginning of time.
Bombadil is absent from Peter Jackson's The Lord of the Rings film trilogy; Jackson explained that this was because he and his co-writers felt that the character does little to advance the story, and including him would make the film unnecessarily long.
Luckily, Gandalf has the good sense to know that Radagast was an innocent player in the betrayal of the Saruman. He knew that Radagast had never intended to betray him: “He had concealed his mind and deceived his messenger. It would have been useless in any case to try to win over the honest Radagast to treachery.
The first Istari sent to Middle-earth to fight against Sauron are the two blue wizards named Alatar and Pallando. Alatar had been chosen by the Valar Orome, the hunter. Alatar didn't want to go alone, though, so he asked his friend Pallando to join him.
2012: The Hobbit: An Unexpected Journey:
After discovering that a shadow has fallen on Greenwood the Great (having had to heal his hedgehog friend Sebastian because of its power), Radagast enters Dol Guldur and is attacked by the Witch-king.