Here are a few excerpts from the actors interview with UK site,
Digital Spy. To read the whole thing where Harris goes into more detail about his villainous role in the upcoming sequel, simply click on the link at the bottom of the page.
We're going to see you as Professor Moriarty in Sherlock Holmes: A Game of Shadows later this year. What's your take on Moriarty and Holmes's rivalry?
"Well I can't really give too much away because they want to keep all the plot details a secret so I can't say anything about that. I will say we've had long talks about how to achieve something that... he's a very famous character and he actually only appears in two stories of Sherlock Holmes, but he's talked about a lot. Since then he's a character or type of character that's been imitated so much. He was the first literary supervillain and supervillains are so well-known now that Mike Myers can do a comedy spoof about them. It's very easy to drift into parody."
What do you hope you bring to the role?
"My thing was, I just never wanted to explain myself. There's always that scene where the villain has to tell you what he's doing and why he's doing it. Guy luckily agreed with me and so did Robert. Why? Why do we need that? You're not going to explain yourself or what you're doing. There's a sort of arrogance about the character that's similar to Sherlock Holmes. They're both incredibly intelligent people, they're chess masters thinking many moves down the line. They don't know all of their opponents moves but they've got a lot of them. They're 20 moves ahead on their own plan. I just always wanted to create a sense that he had something else up his sleeve. As you unfold the story there's another step involved."
Is the door open for you to appear in more Sherlock Holmes movies?
"I can't tell you that! I'm sure they're going to make more Sherlock Holmes films, though. I've no idea if I'll be in them."
Directed by Guy Ritchie and starring Robert Downey, Jr, Jude Law, Noomi Rapace, Jared Harris and Stephen Fry,
Sherlock Holmes: A Game of Shadows is set to be released on December 16, later this year!