After co-starring in HBO's The Outsider and The Third Day, English actor Paddy Considine has been cast as the lead on the network's Game of Thrones prequel series House of the Dragon, Collider has confirmed. Based on George R.R. Martin's book Fire & Blood, the show is set 300 years before the events of Game of Thrones and focuses on the Targaryen clan. Considine will play King Viserys Targaryen, who is chosen by the lords of Westeros to succeed the Old King, Jaehaerys Targaryen, at the Great Council at Harrenhal. Viserys is a kind and …