Actor & Creature Performer
A Welsh actor, creature performer and movement specialist based in London.
As an actor, I trained at the Royal Central School of Speech and Drama.
Multilingual from a young age, I speak Welsh, French, Spanish and English.
My screen work has been seen on the BBC, ITV, Channel 4, 5, Sky, Amazon Prime and at the cinema. In 2025, I join the Whoniverse playing The Shreek in the Doctor Who episode ‘Lucky Day’.
On stage, I have performed all over the UK and Internationally. I was nominated for an OffWest End Award for Starcrossed, a parallel story to Romeo and Juliet in which I played every role besides Tybalt and Mercutio (but including Juliet). Check out some reviews below!
In a previous life, I was also a comedian and Sublime, my debut comedy hour, was performed at the Brighton and Edinburgh Fringes in 2019. BBC Wales filmed it for their programme Wales at the Edinburgh Festival.
![Henry V (Donmar Warehouse) [📷 Helen Murray]](https://images.squarespace-cdn.com/content/v1/583ea568c534a59807d604f4/1691017361472-KMOBS7IOIDQ9AISSJBZM/Henry+V+Training.png)
![Starcrossed (Wilton's Music Hall) [📷Pamela Raith]](https://images.squarespace-cdn.com/content/v1/583ea568c534a59807d604f4/1691017436003-Q0P1FCMUTXT7145L81QG/Sword+Fight_Starcrossed_Pamela+Raith+Photography.jpg)
![Starcrossed (Wilton's Music Hall) [📷 Pamela Raith]](https://images.squarespace-cdn.com/content/v1/583ea568c534a59807d604f4/1691017603077-YEC97FTK4ZNSFUVG425E/130_77A8754_Starcrossed_Pamela+Raith+Photography.jpg)
Acting
Recent Credits:
Film/TV
Doctor Who: Lucky Day (S 15/2, E4), BBC/Disney+/Bad Wolf, dir. Peter Hoar
Einstein and the Bomb, Netflix/BBC Studios, dir. Anthony Philipson
The Boys in the Boat, MGM/Tempesta Films, dir. George Clooney
The Winter King, MGM+/ITVX/Bad Wolf, dir. Anu Menon
Wolf, BBC/APC Studios/Hartswood FIlms, dir. Lee Haven Jones
Andor, Lucasfilm/Disney+, dir. Benjamin Caron
Somewhere Boy, Clerkenwell Films/Channel 4, dir. Alex Winckler/Alexandra Brodski
The Great (S2 & 3), Thruline/Hulu, dir. Colin Bucksey/Matt Moore/Ally Pankiw
The Outlaws, BBC/Big Talk/Amazon, dir. Stephen Merchant
Casualty, BBC, dir. John Maidens
Doctors, BBC, dir. Enda Hughes
Theatre
Romeo & Juliet, Shakespeare’s Globe, dir. Lucy Cuthbertson
Starcrossed, Wilton’s Music Hall, dir. Philip Wilson
Henry V, Donmar Warehouse, dir. Max Webster
Mold Riots, Theatr Clwyd, dir. Katie Posner
Seagulls, Volcano Theatre Company, dir. Paul Davies
Incident at Vichy, Finborough Theatre, dir. Phil Willmott
Press
“astonishingly versatile…a joyous gift for physical comedy, Alderman is an athletic, shape-shifting delight” - ★★★★★ WhatsOnStage
“[Gethin Alderman’s] virtuosic and often amusing versatility binds the show together.” - ★★★★ The Times
“Gethin Alderman plays all the other characters quite deliciously” - David Benedict, The Stage
“manages to make the scene changes both slick and silly, with little more than a few perfectly timed winks, groans and grins” - ★★★★ The Guardian
“A spellbinding performance” - ★★★★★ Broadway Baby
“A miraculous performer” - ★★★★ Attitude
“A powerfully muscular presence” - ★★★★ Buzz Magazine
“Boundlessly energetic presence” - ★★★★ WalesOnline
“ridiculously brilliant…his transformations are astounding” - ★★★★ Broadway World
“[I]t is Gethin Alderman that stands out as Bagsy…Alderman’s Bagsy is a heart-wrenching character who teeters on a sheer precipice as he tries to soothe his mental and emotional hurt” - Sitting on the Fourth Wall
“genuinely impressive…an unpredictable and irreverent hour of controlled chaos.” - ★★★★ The List
“a warm-hearted and mischievous performer” - ThreeWeeks
Contact
For all acting and performance enquiries contact my agent below:
Represented By: Adam @ Narrow Road
1st Floor,
37 Great Queen Street,
Covent Garden,
London WC2B 5AA
For Movement Direction and Coaching enquiries fill in the form on the right:
Headshot Photography by Ruth Crafer