DCI John Luther faces off against his biggest threat in Luther: The Fallen Sun. In the Netflix movie, the famous detective is chasing the homicidal and sinister David Robey, played by Andy Serkis. It's a role similar to the Riddler from Matt Reeves' The Batman -- which Serkis also starred in as Alfred Pennyworth -- that sees David manipulate events and people for his own malevolent purposes. Additionally, it shows a darker side of Serkis as a performer that not many fans have seen before.

In an exclusive conversation with CBR, Serkis broke down what appealed to him about playing such a wicked character. The actor also described how David separates himself from the other Luther villains and revealed which scenes from the film shocked him the most.

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CBR: From trying to stop a serial killer in The Batman to essentially playing one in Luther: The Fallen Sun. How did you get into the mindset to portray David?

Andy Serkis: Well, two things. One was, "Do I really want to play this role?" It was a pretty dark character, and I wasn't quite sure whether that would be a good idea at the moment. But then once I thought about what this role was really about, and David Robey is the tiny conduit at the end of what is a huge monster -- which is the internet and that world -- getting into that was what appealed to me about the whole thing. The debate that might arise from playing this character because here's a technology we've all bought into that is so powerful. That it's almost overwhelming. And David is someone who can manipulate that to shame people. So, it was a really interesting challenge, and I'm really glad I came on board.

How did you separate and differentiate your character from some of the other Luther villains, who are as dastardly as David?

It's true. [Luther creator] Neil Cross has got a very dark mind and writes villains [that] affect people. They work so well because there's something very relatable to them. They're kind of ordinary. Again, the ordinary in this is the internet and the fact that it's something that's become so much part of our lives. But the other villains are so ordinary because they are literally the man under the bed or the man behind the fridge. There's something mundane about the evilness, if you like, of these characters -- and David Robey is no exception. He is almost holding a mirror up to society in a way to reflect back at us what we have done. And that sense of the monster being the internet is what I think connects him -- the ordinariness of it -- to the other villains.

Andy Serkis as disguised David Robey in Luther The Fallen Sun

In a previous interview, you mentioned you wanted to take a shower after reading the script because of how despicable David was. What was the one scene that really shocked you to your core?

[Laughs]. There are two scenes. One is when he goes back to see his wife, and you see a vulnerable side and almost childish side to him. With a character that's unable to really connect to humanity at all, suddenly, there's this personal relationship, and that was quite disturbing. And then, in the final [scene], there's a big showdown in the red bunker, which is a very, very dark scene, where he creates a sense of theater around the dark web, and all his viewers are there to see.

David and Luther slug it out quite a few times in the film. What was the preparation like for these fight scenes?

Yeah, I had to learn how to be very quick and duck out of the way of Luther's power [laughs] because Idris [Elba] is such a formidable fighter. He's a kickboxer. He's a very skilled martial artist. Luckily, we had a great stunt team who actually taught me. It's a combination. The brilliance of what they do is that they work the moves around the character. So it comes from David Robey's character, who they wanted to be very disassociated, not putting a lot of effort into what he does. But he's very skillful at dodging, diving, and being very skillful with a knife without being overly flamboyant. So, it was like being a picador in a bullfight.

Luther: The Fallen Sun hits Netflix on March 10.