“In the last hour Beorn himself had appeared - no one knew how or from where. He came along and in bear’s shape; and he seemed to have grown almost to giant-size in his wrath.”
Beorn joins in the battle of 5 armies by turning into a bear and attacking the Orcs. It’s only a casual mention in the book as something that happened while Bilbo was knocked out, but I still think it would’ve been a very powerful scene if it had been included. I've always liked the way the orcs looked in the cartoon.