Malcolm Merlyn is the father of Thea Queen and Tommy Merlyn. He was responsible for the death of Oliver's father and for the undertaking of the Glades.
Appearances
Arrow
Main cast, played by John Barrowman
- Episode 3x02: Sara (Oct 15, 2014)
- Episode 3x03: Corto Maltese (Oct 22, 2014)
- Episode 3x04: The Magician (Oct 29, 2014)
- Episode 3x05: The Secret Origin of Felicity Smoak (Nov 5, 2014)
- Episode 3x06: Guilty (Nov 12, 2014)
- Episode 3x09: The Climb (Dec 10, 2014)
- Episode 3x10: Left Behind (Jan 21, 2015)
- Episode 3x11: Midnight City (Jan 28, 2015)
- Episode 3x12: Uprising (Feb 4, 2015)
- Episode 3x13: Canaries (Feb 11, 2015)
- Episode 3x14: The Return (Feb 18, 2015)
- Episode 3x15: Nanda Parbat (Feb 25, 2015)
- Episode 3x16: The Offer (Mar 18, 2015)
- Episode 3x17: Suicidal Tendencies (Mar 25, 2015)
- Episode 3x18: Public Enemy (Apr 1, 2015)
- Episode 3x19: Broken Arrow (Apr 15, 2015)
- Episode 3x20: The Fallen (Apr 22, 2015)
- Episode 3x21: Al Sah-Him (Apr 29, 2015)
- Episode 3x22: This is Your Sword (May 6, 2015)
- Episode 3x23: My Name is Oliver Queen (May 13, 2015)
- Episode 4x03: Restoration (Oct 21, 2015)
- Episode 4x07: Brotherhood (Nov 18, 2015)
- Episode 4x08: Legends of Yesterday (Dec 2, 2015)
- Episode 4x09: Dark Waters (Dec 9, 2015)
- Episode 4x12: Unchained (Feb 3, 2016)
- Episode 4x13: Sins of the Father (Feb 10, 2016)
- Episode 4x14: Code of Silence (Feb 17, 2016)
- Episode 4x15: Taken (Feb 24, 2016)
- Episode 4x17: Beacon of Hope (Mar 30, 2016)
- Episode 4x18: Eleven-Fifty-Nine (Apr 6, 2016)
- Episode 4x20: Genesis (May 4, 2016)
- Episode 4x21: Monument Point (May 11, 2016)
- Episode 4x22: Lost in the Flood (May 18, 2016)
- Episode 4x23: Schism (May 25, 2016)
Guest cast, played by John Barrowman
- Episode 1x04: An Innocent Man (Oct 31, 2012)
- Episode 1x05: Damaged (Nov 7, 2012)
- Episode 1x07: Muse of Fire (Nov 28, 2012)
- Episode 1x09: Year's End (Dec 12, 2012)
- Episode 1x11: Trust but Verify (Jan 23, 2013)
- Episode 1x13: Betrayal (Feb 6, 2013)
- Episode 1x15: Dodger (Feb 20, 2013)
- Episode 1x16: Dead to Rights (Feb 27, 2013)
- Episode 1x18: Salvation (Mar 27, 2013)
- Episode 1x19: Unfinished Business (Apr 3, 2013)
- Episode 1x21: The Undertaking (May 1, 2013)
- Episode 1x22: Darkness on the Edge of Town (May 8, 2013)
- Episode 1x23: Sacrifice (May 15, 2013)
- Episode 2x07: State v. Queen (Nov 20, 2013)
- Episode 2x08: The Scientist (Dec 4, 2013)
- Episode 2x22: Streets of Fire (May 7, 2014)
- Episode 2x23: Unthinkable (May 14, 2014)
- Episode 5x08: Invasion! (Nov 30, 2016)
- Episode 5x17: Kapiushon (Mar 22, 2017)
- Episode 5x22: Missing (May 17, 2017)
- Episode 5x23: Lian Yu (May 24, 2017)
- Episode 7x09: Elseworlds, Part 2 (Dec 10, 2018)