Theo James, born December 16, 1984 in Oxford, England, is a British actor who has extended his career into voice acting for animated series and films, particularly within the fantasy genre. He graduated with a degree in philosophy from the University of Nottingham and trained at the Bristol Old Vic Theatre School before gaining recognition for his live-action roles in the Divergent film series and the television series The White Lotus.

In the realm of animation, James is best known for his role as Hector in the Netflix animated series Castlevania. He voiced the character across multiple seasons, including the second, third, and fourth seasons, which aired between 2018 and 2021. Hector is a Devil Forgemaster, a complex figure who serves as a reluctant antagonist and later a supporting protagonist in the series. His other significant voice work includes the role of Vesemir in the animated film The Witcher: Nightmare of the Wolf, released in 2021, as well as the younger version of the same character in the first season of The Witcher series. He also lent his voice to the character Rek'yr in the fantasy series The Dark Crystal: Age of Resistance in 2019. In 2024, it was announced that James would voice a fan-favorite character in the Marvel Studios animated series X-Men 97, marking a notable upcoming addition to his voice acting portfolio. His work in these projects has established him as a voice actor frequently associated with dark fantasy and franchise-based animated storytelling.