• 
  Catherine Ayers

   Lisa Connors (7 episodes)
• 
  Richard Elfyn

   DCI Huw Parry (7 episodes)
• 
  Aneirin Hughes

   Tom Howells (8 episodes)
• 
  Mark Lewis Jones

   Steve Baldini (8 episodes)
• 
  Rhian Morgan

   Marion Howells (8 episodes)
• 
  Eve Myles

   Faith Howells (8 episodes)
• 
  Suzanne Packer

   Delyth Lloyd (English) (7 episodes)
• 
  Menna Trussler

   Eira Jones (4 episodes)

• 
  Mali Harries

   Bethan Price (8 episodes)
• 
  Eiry Thomas

   DI Williams (8 episodes)
• 
  Bradley Freegard

   Evan Howells (8 episodes)
• 
  Matthew Gravelle

   Terry Price (8 episodes)
• 
  Betsan Llwyd

   Delyth Lloyd (Welsh) (7 episodes)
• 
  Hannah Daniel

   Cerys Jones (8 episodes)
• 
  Pinar Ögün

   Dr. Meral Alpay (5 episodes)

• 
  Alex Harries

   Arthur Davies (7 episodes)
• 
  Kizzy Crawford

   PC Emma Jones (6 episodes)
• 
  Demi Letherby

   Alys Howells (8 episodes)
• 
  Lacey Jones

   Megan Howells (8 episodes)
• 
  Seren Letherby

   Rhodri Howells (8 episodes)
• 
  Mark Preston

   Policeman (8 episodes, 2017)
• 
  Glyn Pritchard

  (3 episodes, 2017)
• 
  Shelley Rees

   DS Morgan (3 episodes, 2017)
• 
  Nia Roberts

   Saran James (2 episodes, 2017)
• 
  Ryland Teifi

   Owens (2 episodes, 2017)
• 
  Gareth Jewell

   Gavin John (2 episodes, 2017)
• 
  Colin Murtagh

   Policeman (5 episodes, 2017)
• 
  Lowri Palfrey

   Erin Glynn (2 episodes, 2017)
• 
  Harry Unsworth

   Rhodri Howells (2 episodes, 2017)
• 
  Oscar Unsworth

   Rhodri Howells (2 episodes, 2017)
• 
  Angeline Ball

  6 episodes, 2017
• 
  Paul Blackwell

  2 episodes, 2017
• 
  Elen Rhys

  2 episodes, 2017
• 
  John Paul Davies

  3 episodes, 2017
• 
  Steffan Rhodri

  5 episodes, 2017-2019
• 
  Anastasia Hille

  6 episodes, 2019
• 
  Martha Bright

  6 episodes, 2019
• 
  Rhashan Stone

  6 episodes, 2019
• 
  Aimee-Ffion Edwards

  6 episodes, 2019
• 
  Brochan Evans

  6 episodes, 2019