The executive producers had worked with Bradley James in DisConnected and he was at the back of their minds for the role of Arthur. He was the only actor they had considered for one of the roles before the casting process. They liked the fact that he is good looking, has a good level of comedy and the potential to portray the future king of legend. Ben Mansfield also auditioned for the role getting to the last two.
Other recurrent and guest stars that were also in DisConnected are Caroline Faber (episodes 1x01 The Dragon's Call, 1x10 The Moment of Truth and 1x13 Le Morte d'Arthur), Holly Grainger (episode 1x07 The Gates of Avalon) and Kyle Redmond-Jones (episode 1x09 Excalibur).