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 joined the Whoniverse playing The Shreek in the Doctor Who episode ‘Lucky Day’ and brand new mini-series The War Between the Land and the Sea.

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!

My solo comedy show 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.

Acting

Recent Credits Include:

Showreel →
Voice →
Spotlight →
IMDB →

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

The Dutch House,
307 -308 High Holborn,
London WC1V 7LL

+44 (0) 207 831 4450

agents@narrowroad.co.uk

For Movement Direction and Coaching enquiries fill in the form :

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Headshot Photography by Ruth Crafer