This article is a stub. You can help Baker Street Wiki by expanding it. Kevin Trainor Information Character Billy Appearances "The Hounds of Baskerville" Kevin Trainor is an Irish actor who portrayed Billy in Sherlock. He is best known for his role as the young Trevor Bruttenholm in Hellboy. External links Kevin Trainor on the Internet Movie Database. Retrieved from "https://bakerstreet.fandom.com/wiki/Kevin_Trainor?oldid=40991" Categories: Article stubs Actors: Sherlock (2010) Community content is available under CC-BY-SA unless otherwise noted.