The former Lost star takes on the dual part of Algrim the Strong and Kurse. According to comic book canon, Algrim is a powerful Dark Elf who is persuaded to fight Thor.
After a betrayal leads to his injury in battle, Algrim is healed and transformed into the far more powerful Kurse.
"It's almost like he's made out of stone," Akinnuoye-Agbaje explained to The Los Angeles Times about his physicality as Kurse. "It's an amalgamation of a bull and a lava-like creature.
"He has very animalistic tendencies but with this insatiable and unstoppable power. As an actor, that's one of the hardest things to embody. You have to realise you are probably the most powerful thing you could imagine.
"And you have to be that. You can't pretend, so that when you face Thor, it's real."
Akinnuoye-Agbaje has previously revealed that he will fight both Thor (Chris Hemsworth) and established villain Loki (Tom Hiddleston) in Alan Taylor's sequel.
> 'Iron Man 3' ending revealed, tied to another Marvel movie? - spoilers
> 'Thor 2' has a darker feel, says Jaimie Alexander
Thor: The Dark World will be released on October 30 in the UK, and November 8 in the US.
Watch Tom Hiddleston discussing Thor: The Dark World with Digital Spy below: