In casting the role of Arthur, the decision was between Bradley James (who took the part) and Ben Mansfield.
The following actors have all appeared in separate episodes of Doctor Who: Colin Morgan, Richard Wilson Anthony Head, Angel Coulby, Eve Myles, Lindsay Duncan Michelle Ryan, Joe Dempsie, Georgia Moffett, Sarah Parish, Pauline Collins,Alun Raglan, Rick English, Alex Price, Colin Salmon, Jem Wall, Sarah Counsell, Tom Hopper and Miranda Raison.
According to cast members, Bradley James is a vicious prankster, with Angel Coulby getting the most flack from him.
Emilia Fox was pregnant during the filming of Series 3.
Katie McGrath uses her natural Irish accent in the series, while Irish actor Colin Morgan fakes an English accent. Katie almost didn't get her role because "Merlin" producers didn't want two actors speaking with an Irish accent in the series, and they were ready to reject her for a role if she couldn't sound English, that is if Colin couldn't nail the English accent first.
Colin Morgan often has to stand indoors or in the shade when he's not shooting to avoid looking pale in one scene and tanned in the next.
On 21 June 2009, this series was broadcast on NBC in the U.S. It marked the first time a UK drama has aired on a major U.S. network since The New Avengers over 30 years ago.
The distributor FremantleMedia Enterprises sold series one to 52 broadcasters in more than 180 countries, and the sales of series two resulted in buyers in more than 165 countries.
Production Process: A French stuntman broke one of his ribs while shooting a jousting scene, the balsa wood on the end of lance the other stuntman was using didn't shatter correctly.