• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki)
• And: Gabriel Byrne (Earl Haraldson)
• Guest Starring: John Kavanagh (The Seer), David Pearse (Svein), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Eddie Drew (Odin), Ruby O'Leary (Gyda), Gerard McCarthy (Brondsted), Billy Gibson (Ulf), Eddie Elks (Olafur), David Wilmot (Olaf Anwend), Conor Madden (Eric Trygyvasson), Donna Dent (Woman), Cian Quinn (Olaf son of Ingolf)
• Written By: Michael Hirst
• Directed By: Johan Renck

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki)
• And: Gabriel Byrne (Earl Haraldson)
• Guest Starring: Vladimir Kulich (Eric), David Pearse (Svein), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Diarmaid Murtagh (Leif), Tadhg Murphy (Arne), Jefferson Hall (Torstein), Jouko Ahola (Kauko), Eric Higgins (Knut), Craig Whittaker (Hakon), Eddie Elks (Olafur), Paul Kealyn (Blacksmith), Carolyn Murray (Blacksmith's Daughter), Amber Jean Rowan (Floki's Slave Girl), Ruby O'Leary (Gyda), Will Irvine (Brother Cenwulf), Des Braiden (Father Cuthbert), Eddie Jackson (Monk), Nathan Gordon (Monk), Martin Phillips (Old Monk), Sebastian Vermeul Taback (Osiric)
• Written By: Michael Hirst
• Directed By: Johan Renck

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki)
• And: Gabriel Byrne (Earl Haraldson)
• Guest Starring: Vladimir Kulich (Eric), David Pearse (Svein), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Jouko Ahola (Kauko), Tadhg Murphy (Arne), Diarmaid Murtagh (Leif), Gary Farrelly (Young Boy), Will Irvine (Brother Cenwulf), Carrie Crowley (Ellisef), Kevin McCann (Man in Kattegat), Eric Higgins (Knut), Ruby O'Leary (Gyda), Sam Doyle (Saxon #1), Sam Smith (Saxon #2)
• Written By: Michael Hirst
• Directed By: Johan Renck

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki), George Blagden (Athelstan)
• And: Gabriel Byrne (Earl Haraldson)
• Guest Starring: Ivan Kaye (King Aelle), John Kavanagh (The Seer), Vladimir Kulich (Eric), David Pearse (Svein), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Tadhg Murphy (Arne), Diarmaid Murtagh (Leif), Jefferson Hall (Torstein), Jouko Ahola (Kauko), Eric Higgins (Knut), Sam Doyle (Saxon #1), Sam Smith (Edwin), Jonathon Kemp (Wigea), Peter Gaynor (Lord Edgar), Simon Coury (Saxon Priest), Elinor Crawley (Thyri), Carrie Crowley (Ellisef)
• Written By: Michael Hirst
• Directed By: Ciarán Donnelly

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki), George Blagden (Athelstan)
• And: Gabriel Byrne (Earl Haraldson)
• Guest Starring: David Pearse (Svein), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Kevin Flood (Old Man), Maude Hirst (Helga), Elinor Crawley (Thryl), Trevor Cooper (Earl Bjarni), Jefferson Hall (Torstein)
• Written By: Michael Hirst
• Directed By: Ciarán Donnelly

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki), George Blagden (Athelstan)
• And: Gabriel Byrne (Earl Haraldson)
• Guest Starring: John Kavanagh (The Seer), Ivan Kaye (King Aelle), David Pearse (Svein), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Gavan Duffy (Housecarl 1), Trevor Cooper (Earl Bjarni), Elinor Crawley (Thryl), Ruby O'Leary (Gyda), Jefferson Hall (Torstein), Diarmaid Murtagh (Leif), Tadhg Murphy (Arne), Maude Hirst (Helga), Angus MacInnes (Tostig), Roanna Cochrane (Slave Girl), Christina Forbes (Old Woman / Grim Giantess), Dez McMahon (Haraldson Kinsman), Michael Liebmann (Messenger), Jonathan Kemp (Wigea), Peter Gaynor (Lord Edgar)
• Written By: Michael Hirst
• Directed By: Ciarán Donnelly

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki), George Blagden (Athelstan)
• Guest Starring: Ivan Kaye (King Aelle), David Murray (Lord Aethelwulf), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Jefferson Hall (Torstein), Tadhg Murphy (Arne), Diarmaid Murtagh (Leif), Angus MacInnes (Tostig), Cathy White (Ealswith), Sean Treacy (Egbert), Tristan McConnell (Saxon Warrior), Peter Gaynor (Lord Edgar), Matt Ryan (Peasant Man), Deirdre Mullins (Peasant Woman), Cillian O'Gairbhi (Saxon Warrior #2), Andy Kellegher (Saxon Warrior #1), Gary Murphy (Bishop Unwan), Jonathan Ryan (Noble 3), James Flynn (Eadric), Michael James Ford (Noble 2), Alexander Downes (Noble 5)
• Written By: Michael Hirst
• Directed By: Ken Girotti

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki), George Blagden (Athelstan), Donal Logue (King Horik)
• Guest Starring: John Kavanagh (The Seer), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Ruby O'Leary (Gyda), Diarmaid Murtagh (Leif), Tadhg Murphy (Arne), Jefferson Hall (Torstein), Maude Hirst (Helga), Elinor Crawley (Thyri), Damien Devaney (Priest 1), Paul Ward (Priest 2), Niall O'Sioradain (Priest Uppsala), Steve Wilson (Horik's Companion), Rudi Kennedy (Young Man)
• Written By: Michael Hirst
• Directed By: Ken Girotti

• Starring: Travis Fimmel (Ragnar), Katheryn Winnick (Lagertha), Clive Standen (Rollo), Jessalyn Gilsig (Siggy), Gustaf Skarsgård (Floki), George Blagden (Athelstan), Alyssa Sutherland (Aslaug), Donal Logue (King Horik)
• Guest Starring: Thorbjørn Harr (Jarl Borg), John Kavanagh (The Seer), Nathan O'Toole (Bjorn Lothbrok)
• Additional Cast in Order of Appearance: Tadhg Murphy (Arne), Jefferson Hall (Torstein), Ruby O'Leary (Gyda), Elinor Crawley (Thyri), David Michael Scott (Nils), Michelle Costello (Female Servant #1), Rebecca Grimes (Female Servant #2), Michelle Beamish (Female Servant #3), Hillary Rose (Female Servant #4)
• Written By: Michael Hirst
• Directed By: Ken Girotti