Thaddea Graham is a rising Northern Irish actress who has steadily built a strong and diverse portfolio across British and international television. She first gained prominence with her breakout role as Iona in Netflix’s fantasy series The Letter for the King (2020), followed by a lead role as Bea in the Sherlock Holmes-inspired series The Irregulars (2021). Her performances have consistently demonstrated a strong screen presence and emotional depth, leading to roles in major productions such as Curfew, Us, and Doctor Who: Flux (2021), where she portrayed the mysterious character Bel.
Born in Changsha, China, Graham was adopted at one year old and raised in County Down, Northern Ireland. She was one of the first international adoptees in the region, and her early life story is a unique part of her identity. She attended Killinchy Primary School and Bloomfield Collegiate School before pursuing acting at the prestigious Arts Educational School in London, graduating in 2018. Her academic training and multicultural background have both contributed to her compelling performances and wide-ranging character portrayals.
In recent years, Graham’s career has continued to ascend. She starred as Vivian Lim in the BBC horror comedy Wreck and joined Sex Education’s final season in 2023 as the character “O.” She was also recognized as a 2023 Screen International Rising Star of Ireland, cementing her status as a talent to watch. Looking ahead, she is set to appear in the upcoming David E. Kelley series Margot’s Got Money Troubles, a promising project that marks her continued expansion into high-profile international productions.
