With the immensely popular TV show culminating earlier this year, Harington - who played fan-favorite Jon Snow - can take up other projects.
He was confirmed for the role of Marvel Comics' Dane Whitman A.K.A Black Night in The Eternals back in August and, while he's excited to begin a new journey in the MCU, the actor says he's terrified.
"A lot of people who go into something like the MCU, they haven't had experience of, maybe, a franchise that big," the 32-year-old said during the ACE Comic-Con in Chicago on the weekend. "I've lived with Thrones for ten years, I've known a big franchise and something that's created a world and it has a huge fan base. So for both reasons, I'm excited and terrified.
"I know the responsibility of actors who came into Thrones knowing that they're playing a beloved character and that they had a responsibility to fans and to people to do something with that character. And for me, looking at this new universe, I'm prepared because I've been part of a universe... but I also have been part of a universe, so I am terrified."
Harington also revealed he's looking to get as far away from Jon Snow as possible but teased that his new character will wield a sword, much like the Targaryen hero from the captivating series.
His appearance at Comic-Con was a bit personal as he wanted to experience the passion fans have for the MCU.
"Coming here, I can see just how passionate people are about this world," he added. "This is the first time I've met people on that level about Marvel and I'm just thrilled. It's a whole new chapter and a whole new character to start thinking about. Without saying too much at all, on the surface, [Black Knight] can look like Jon Snow in the comics but there is actually a lot to be done that is different."