Harris says his role is "very much in the shadows" for most of the film and he's not sure if he'll be back for another entry - "I think they're still trying to get this one ready and out there before they start thinking about the next one."
Harris adds that the tone will be faster and more action-oriented than the first film - "There's some fisticuffs. It's great fun. It's sort of like the story kind of starts a lot faster than the last one, almost like you're coming in the third act of the story almost."
The film stars Robert Downey Jr, Jude Law, Noomi Rapace, Rachel McAdams, and Stephen Fry.
Guy Ritchie’s Sherlock Holmes sequel hits theaters later this year on December 16th.