- Ep: 1
- Homecoming
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Peter Mooney (Kay), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Guest Starring: Lucy Cohu (Arthur's Mother), Sebastian Koch (King Uther), Sean Pertwee (Ector), James Purefoy (King Lot)
- Additional Cast: Caoimhe O'Malley-Doyle (Scullery Girl), Diarmaid Murtagh (Brastias), Jamie Downey (Ulfius), Adam Goodwin (Pellinor), Joe Doyle (Uriens), Mieke Dockley (Anna), Ian Bartholomew (Catrain), George McMahon (Messenger), John Benfield (Alded), Hope Brown (Old Duke of Cornwall), David Coakley (Lot's Outrider), Brian McGuinness (Nentes), Colin J. Maher (Duke of Cornwall), Fergus Kealy (Scotland)
- Teleplay By: Chris Chibnall
- Story By: Michael Hirst & Chris Chibnall
- Directed By: Ciarán Donnelly
- Ep: 2
- The Sword and the Crown
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Peter Mooney (Kay), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Guest Starring: Sean Pertwee (Ector), James Purefoy (King Lot)
- Additional Cast: Jamie Downey (Ulfius), Diarmaid Murtagh (Brastias), Adam Goodwin (Pellinor), George McMahon (Messenger), Peter O'Byrne (Naysayer), Fergus Kealy (Scotland), Brian McGuinness (Nentes), Colin J. Maher (Duke of Cornwall), John Lovett (Archbishop), Caoimhe O'Malley-Doyle (Scullery Girl)
- Written By: Chris Chibnall
- Directed By: Ciarán Donnelly
- Ep: 3
- Guinevere
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Chipo Chung (Vivian), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Additional Cast: Kevin Shakleton (Ginger), Lara Jean Chorostecki (Bridget), Daragh O'Malley (Leodegrance), Guy Carlton (Beseecher), Diarmaid Murtagh (Brastias), Jamie Downey (Ulfius), Ed Cosgrove (Borin), Caoimhe O'Malley-Doyle (Scullery Girl)
- Teleplay By: Louise Fox
- Story By: Chris Chibnall & Louise Fox
- Directed By: Jeremy Podeswa
- Ep: 4
- Lady of the Lake
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Chipo Chung (Vivian), Sinéad Cusack (Sybil), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Guest Starring: Sebastian Koch (King Uther), James Purefoy (King Lot), Vincent Regan (Caliburn)
- Additional Cast: Diarmaid Murtagh (Brastias), Jamie Downey (Ulfius), Lauren Coe (Excalibur), Lara Jean Chorostecki (Bridget), Colmcille Donnelly (Warrior), Ed Cosgrove (Borin)
- Written By: Louise Fox & Chris Chibnall
- Directed By: Jeremy Podeswa
- Ep: 5
- Justice
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Chipo Chung (Vivian), Sinéad Cusack (Sybil), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Guest Starring: Liam Cunningham (Colfur), Steven Mackintosh (Ewan)
- Additional Cast: Lauren Coe (Excalibur), Marek Toth (Wade), Mella Carron (Katelyn), Lara Jean Chorostecki (Bridget), Shashi Rami (Cook), Shaun Dingwall (Ernald), Jonathan Ryan (Merchant 2), Diarmaid Murtagh (Brastias), Jamie Downey (Ulfius), Michael Fitzgerald (Tomal)
- Written By: Sarah Phelps & Terry Cafolla
- Directed By: Stefan Schwartz
- Ep: 6
- Three Journeys
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Chipo Chung (Vivian), Sinéad Cusack (Sybil), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Guest Starring: Sean Pertwee (Ector)
- Additional Cast: Daragh O'Malley (Leodegrance), Lily Walsh (Young Guinevere), Lara Jean Chorostecki (Bridget), Diarmaid Murtagh (Brastias), Jamie Downey (Ulfius), George McMahon (Messenger), Sam O'Mahony (Warin), Lorcan Melia (Mary's Son), Melanie Clarke Pullen (Mary), Nick Devlin (Herlewin), Janine Wood (Bela), Anne Skellern (Arwen), Rachel Joyce (Sara), Shay Macleod (Young Arthur), Oscar Quinn (Young Kay)
- Written By: Chris Chibnall
- Directed By: Stefan Schwartz
- Ep: 7
- The Long Night
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Chipo Chung (Vivian), Sinéad Cusack (Sybil), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Additional Cast: Dara Devaney (Harwel), Diarmaid Murtagh (Brastias), Jamie Downey (Ulfius), Lara Jean Chorostecki (Bridget), Helen O'Reilly (Dancer 1), Sarah Mulligan (Dancer 2), Ekaterina Zalitko (Dancer 3), Dominika Van Santen (Dancer 4), Pierina Borrotzu (Dancer 5), Jade Lorna Sullivan (Dancer 6), Augustina Amoa (Dancer 7), Maria Nelson (Dancer 8), Jordan Brown (Girl), Conor Delaney (Morgan's Captain)
- Written By: Steven Lightfoot
- Directed By: Mikael Salomon
- Ep: 8
- Igraine
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Chipo Chung (Vivian), Sinéad Cusack (Sybil), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Additional Cast: Rachel Brady (Servant), Lara Jean Chorostecki (Bridget), Diarmaid Murtagh (Brastias), Alfie Davis (Redwald), Barry McEvoy (Donal), Jamie Downey (Ulfius)
- Teleplay By: Chris Chibnall & Steven Lightfoot
- Story By: Chris Chibnall & Louise Fox
- Directed By: Michelle MacLaren
- Ep: 9
- The Battle of Bardon Pass
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Chipo Chung (Vivian), Sinéad Cusack (Sybil), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Additional Cast: Tyler Kennington (Albion), Enda Kilroy (Border Guard), Dara Devaney (Harwel), Paul McGlinchey (Wallace), Sebastian Spence (Lucan), Tony McKenna (Mercenary 1), Tristan McConnell (Mercenary 2), Jamie Downey (Ulfius), Diarmaid Murtagh (Brastias), Darryl Kinsella (Camelot Guard), Shane Gately (Acton), Gordon Mahn (Alric), Ciaran Gallagher (Griffith), Aoife Moloney (Injured Woman), Ed Cosgrave (Borin), Andrew Keane (Mercenary 4)
- Written By: Louise Fox & Chris Chibnall
- Directed By: Mikael Salomon
- Ep: 10
- Reckoning
- Starring: Joseph Fiennes (Merlin), Jamie Campbell Bower (Arthur), Tamsin Egerton (Guinevere), Claire Forlani (Igraine), Chipo Chung (Vivian), Sinéad Cusack (Sybil), Peter Mooney (Kay), Clive Standen (Gawain), Philip Winchester (Leontes)
- And: Eva Green (Morgan)
- Additional Cast: Dara Devaney (Harwel), David Coakley (Fourth Marauder), Paul McGlinchey (Wallace), Jeff Doyle (Marauder One), Ciaran Kenny (Marauder Two), Diarmaid Murtagh (Brastias), Lara Jean Chorostecki (Bridget), Elaine Fox (Hilda), Sebastian Spence (Lucan), Tyler Kennington (Albion), Ciaran Gallagher (Griffith), Ed Cosgrove (Borin), Darryl Kinsella (Camelot Guard)
- Written By: Terry Cafolla & Chris Chibnall
- Directed By: Mikael Salomon & Stefan Schwartz
| Joseph Fiennes ............................ Merlin |
| Jamie Campbell Bower ................. King Arthur |
| Tamsin Egerton ......................... Guinevere |
| Claire Forlani ..................... Queen Igraine |
| Chipo Chung ............................... Vivian |
| Sinéad Cusack .............................. Sybil |
| Peter Mooney ............................. Sir Kay |
| Clive Standen ......................... Sir Gawain |
| Philip Winchester .................... Sir Leontes |
| Eva Green ................................. Morgan |
