Game Of Thrones Casts Hafthor Julius Bjornsson As Gregor Clegane

Clegane has a big role in the third book of George R. R. Martin's A Song of Ice and Fire novels. Because of this, it's a little surprising that the character didn't fit into Season 3 anywhere. However, since the book, A Storm of Swords, is being split into Season 3 and Season 4, there's no need to rush the plot or shoehorn in characters for the sake of shoehorning in characters.