Gerald Kyd (born Gerasimos Avvakoumides, 1973) is a Scottish actor of Greek descent. He became known for his role as Sean Maddox in the BBC medical drama Casualty.
Early life and education Gerald Kyd was born as Gerasimos Avvakoumides in Pretoria, South Africa. His father was Greek and his mother Scottish.
He moved to England after his parents divorced when he was 14, and studied at the London Academy of Music and Dramatic Arts for three years, graduating in 1997.
Career Kyd was spotted by an agent who gave him work immediately after graduating. He later spent seven months performing in live theatre with the Royal Shakespeare Company.
He starred as Sean Maddox in the BBC medical drama Casualty from 1998 until 2000, later reprising the role for a few episodes in 2006.
Kyd subsequently appeared in many British TV series, including The Split in 2022, Malory Towers in 2024, and The Assassin in 2025.
He played MI6 agent Thomas Mercer in the 2025 Netflix miniseries Hostage, and in 2026 played Mylonas in the Netflix crime drama series Legends.
Filmography Films Year Title Role Notes2003The Principles of LustWaiter2003Lara Croft: Tomb Raider – The Cradle of LifeSean's Man2004The DefenderMorganDirect-to-video
Television Year Title Role Notes1997UnderworldNiko 1 episode1998–2000, 2006 CasualtySean MaddoxMain cast (series 13—14), recurring role (series 21)1999CI5: The New ProfessionalsDerbegEpisode: "Hostage" 2003Grease MonkeysJeremyEpisode: "Hey Fever"2004In Search of ShakespeareVariousMiniseries, ensemble cast 2006Brief EncountersSteveMiniseries, episode: "All in a Day's Work"2006All in the GameRatza TV movie2010Persons UnknownMark RenbeSummer replacement limited series, main cast2013The BibleCyrusMiniseries, episode: "Survival" 2016SherlockThomas RicolettiEpisode: "The Abominable Bride" 2017 Silent Witness Yusuf Hamed 2 episodes: "Identity (parts 1 & 2)"2018UnforgottenAdrian Mullery Recurring role (series 3) 2019 Jesus: His Life Caiaphas Episode: "Caiaphas: The Raising of Lazarus" 2021 Doctor Who General Logan Episode: "War of the Sontarans"2022The SplitJ.J. JohnsonRecurring role (series 3) 2024 Malory Towers Mr. Murray Recurring role (season 5) 2025 The Assassin Luka Main cast 2025 Hostage Agent Thomas Mercer Miniseries, supporting cast2026LegendsMylonas6 episodes
Theatre credits
The Seagull – Boris Trigorin – Royal Shakespeare Company Cyrano De Bergerac – Chevalier D'Antignac-Juzet The Prophet in Exile – Khalil Gibran – The Pit and the Pendulum – William – Loves Labours Lost – King Ferdinand – English Touring Theatre Deathtrap – Clifford Anderson – The Local Stigmatic – David – Lyric Theatre, Hammersmith The Ramayana – Rama – Birmingham Richard II – Henry Hotspur Percy – Globe Theatre Edward II – Gaveston – Globe Theatre Revelations – Tony – Hampstead Theatre, London Conversations in Havana – Che – The Three Musketeers – Athos – Bristol Old Vic Blood and Gifts – Colonel Afridi – Royal National Theatre (2010) The Real Thing – Henry – West Yorkshire Playhouse, Leeds & UK Tour (2012) 55 Days – John Lilburne – Hampstead Theatre, London (2012) Richard III – Catesby – Trafalgar Studios, London (2014) Feed the Beast – Michael – Birmingham Repertory Theatre (2015) Hapgood – Ridley – Hampstead Theatre (2015)
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