Primeval

Main

 * Andrew-Lee Potts as Connor Temple (main season 1-present)
 * Hannah Spearritt as Abby Maitland (main season 1-present)
 * Douglas Henshall as Nick Cutter (main season 1-3)
 * James Murray as Stephen Hart (main season 1-2)
 * Lucy Brown as Claudia Brown (main season 1) and Jenny Lewis (main season 2-3, 7-8, guest season 4, 6)
 * Ben Miller as James Lester (main season 1-)
 * Juliet Aubrey as Helen Cutter (main season 1-3, 7-present)
 * Ben Mansfield as Hilary Becker (main season 3-)
 * Laila Rouass as Sarah Page (main season 3)
 * Jason Flemyng as Danny Quinn (main season 3, guest season 4)
 * Ciaran McMenamin as Matt Anderson (main season 4-7)
 * Ruth Kearney as Jess Parker (main season 4-)
 * Ruth Bradley as Emily Merchant (main season 4-)
 * Alexander Siddig as Philip Burton (main season 4-5)
 * Katie Leung as Ying Chunhua (main season 6-7)
 * Erica Carroll as Alana Zedd (main season 8-)

Supporting

 * Mark Wakeling as Tom Ryan (supporting season 1)
 * Karl Theobold as Oliver Leek (supporting season 2)
 * Tim Faraway as The Cleaner (supporting season 2-3)
 * Naomi Bentley as Caroline Steel (supporting season 2, season 6-8)
 * Belinda Stewart-Wilson as Christine Johnson (supporting season 3, 6-)
 * Robert Lowe as Jack Maitland (supporting season 3, guest season 6)
 * Jonathon Byrne as Patrick Quinn (supporting season 4 & 8)
 * Anton Lesser as Gideon Anderson (supporting season 4)
 * Rory Keenan as Michael Miller (guest season 4, supporting season 7-8)
 * Janice Byrne as April Leonard (supporting season 5)
 * Franz Drameh as Riley Jacobs (supporting season 9)