Biography

Thea Achillea is a British-Greek actress who began her acting career at the age of three and has since developed an increasingly international career across film and television. Known for her maturity, emotional depth and natural screen presence, Thea has gained experience across a diverse range of productions from an early age.

Her film credits include Steve McQueen’s Blitz, in which she portrayed Cathy, and the international production The Elf and the Christmas Wonder, filmed in Finland, in which she plays the leading role of Talvi. Her television credits include The Witcher, A Christmas Carol, Back to Life and London Pride.

In Blitz, Thea worked under the direction of Academy Award-winning filmmaker Steve McQueen, delivering a performance that demonstrated a maturity and composure beyond her years. Her role as Talvi in The Elf and the Christmas Wonder further expanded her international experience, with the production filmed on location in Finland.

Thea’s work has already received industry recognition. In 2025, she was named among the Top 100 Child Prodigies in the World in the acting and theatre category. In June 2026, she received a Next Up Award for Best Child in a Film for her performance in Blitz.

Represented by United Agents, Thea continues to build her career internationally, with a growing body of work across film and television.
- IMDb mini biography by: Rebecca Achillea