James Marsters is an American actor who played John Hart in the Torchwood episodes Kiss Kiss, Bang Bang, Fragments and Exit Wounds. He later reprised his role for the 2018 Big Finish Torchwood audio story The Death of Captain Jack and the series The Sins of Captain John.
Marsters is best known for his performances as the vampire Spike in Buffy the Vampire Slayer and its spin-off, Angel. Other recurring roles in popular science fiction/fantasy series include the role of Milton Fine/Brainiac in Smallville, as well as Barnabas Greeley in Caprica.
He has also guest starred in Star Wars: The Clone Wars, Numb3rs, and Lie To Me, and his film credits include Dragonball Evolution and P.S. I Love You. In 2011 he once again acted alongside Torchwood star Naoko Mori, in the SYFY TV movie Three Inches.
Besides acting, Marsters is also a musician. Not only is he a singer/songwriter, but also plays the guitar, and has performed both with his band Ghost Of The Robot as well as a solo artist.