Sion Daniel Young

His first professional role was appearing in Daf James play Llwyth (Tribe), which was the first play about gay characters written by a queer person on a Welsh-language stage. He played the role of Albert Narracott in War Horse at the Royal National Theatre, London in 2013.

In 2015, he had the lead role of Christopher Boone in the stage play adaptation of The Curious Incident of the Dog in the Night-Time at the Gielgud Theatre in London.

In 2018, he appeared in the World Premiere production of Barney Norris’s play Nightfall at the Bridge Theatre, London, alongside Claire Skinner and Ophelia Lovibond.

He appeared in the 2012 war film Private Peaceful. In 2014, he appeared in World War One-centenary series Our World War alongside Theo Barklem-Biggs.

He had the lead role in 2019 television film drama The Left Behind. For the role he was nominate for Best Actor at the 2020 BAFTA Cymru awards. The film won BAFTA and Royal Television Society awards for Best Single Drama.

In 2020, he appeared as Gareth in the third series of S4C drama Keeping Faith. He also had a role in Aberystwyth-set crime noir Hinterland. In 2021, he could be seen in Channel 4 miniseries Deceit playing real-life character Colin Stagg, a man wrongly accused of murder in 1992, described as one of the gravest miscarriages of justice in British legal history.

In series three of Apple TV+ espionage thriller Slow Horses, he played Douglas, an MI5 records keeper. He also appeared in Channel 5 crime thriller Witness Number 3.

In 2024, he had a lead role in BBC One drama Lost Boys and Fairies. Written by Daf James, it was BBC One’s first primetime gay adoption drama. That year, he was cast in Cardiff-set BBC One series The Guest.