Casualty series 21

The twenty-first series of the British medical drama television series Casualty commenced airing in the United Kingdom on BBC One on 23 September 2006 and finished on 4 August 2007. This saw an increase in episodes to 48.

Main characters

 * Daphne Alexander as Nadia Talianos (from episode 26)
 * Luke Bailey as Sam Bateman (until episode 38)
 * Matt Bardock as Jeff Collier (episodes 24−39)
 * Ian Bleasdale as Josh Griffiths (until episode 17, from episode 36)
 * Georgina Bouzova as Ellen Zitek (until episode 16)
 * Liz Carling as Selena Donovan (until episode 48)
 * Susan Cookson as Maggie Coldwell
 * Elyes Gabel as Guppy Sandhu
 * Kip Gamblin as Greg Fallon
 * Sam Grey as Alice Chantrey
 * Jane Hazlegrove as Kathleen "Dixie" Dixon (from episode 3)
 * Joanne King as Cyd Pyke (from episode 3)
 * Martina Laird as Comfort Jones (until episode 10)
 * Simon MacCorkindale as Harry Harper (until episode 25, from episode 47)
 * Janine Mellor as Kelsey Phillips
 * Peter O'Brien as Theo "Stitch" Lambert (episodes 31−48)
 * Suzanne Packer as Tess Bateman
 * Ben Price as Nathan Spencer
 * James Redmond as John "Abs" Denham
 * Derek Thompson as Charlie Fairhead

Recurring and guest characters

 * Holly Aird as Laura Merriman (episodes 13−16)
 * Elizabeth Bell as Peggy Spencer (episode 19)
 * Alice Bird as Maria Harwood (episodes 42−43)
 * George Costigan as Stephen Gregory MP (episodes 13−14)
 * Frank Grimes as Jim McConvey (episodes 30−31)
 * Jack Dedman as Louis Fairhead (episodes 12−16)
 * David Firth as Richard Bardon (episodes 6−40)
 * Brenda Fricker as Megan Roach (episode 29)
 * Romy Irving as Rosie Merriman (episodes 13−16)
 * Gerald Kyd as Sean Maddox (episodes 5−10)
 * Stella Madden as Nora McConvey (episodes 30−31)
 * Neil McDermott as Ben Harold (episodes 9 and 13)
 * Stephen McGann as Sam Roach (episode 29)
 * James Midgley as Liam York (episodes 30−31)
 * Jacqueline Pearce as Elspeth Lang (episodes 10 and 12)
 * Cathy Shipton as Lisa "Duffy" Duffin (episodes 1−2)
 * Julia St John as Sarah Evans (episode 16)