Warner Bros. Entertainment, Inc. ; created by Mark Schwahn ; written by Mark Schwahn ; directed by Greg Prange ; producer, R. Lee Fleming, Jr. ; produced by David Blake Hartley
a BBC Cymru Wales Drama Production ; executive producers, Brian Minchin and Steven Moffat ; directed by Jamie Payne ; written by Steven Moffat ; produced by Marcus Wilson
BBC ; 2 entertain ; devised by Bill Gallagher ; directors, Sue Tully and Patrick Lau ; writers, Bill Gallagher and Rachel Bennette ; producer, Ann Tricklebank