In the "Thor" sequel, Eccleston will essay the role of Malekith the Accursed, who is one of Thor's archenemies, reported Ace Showbiz.
"Thor 2" will involve the Dark Elves and will be shot underground. The sequel was earlier set to be filmed this summer in some long tunnels in London. In Marvel comics, the Dark Elves of Svartalfheim are living in caverns and underground places.
Before Eccleston, Mads Mikkelsen was eyed to play the villainous role. The Danish actor, however, turned down the offer due to his busy schedule on NBC's "Hannibal".
The film will bring back Chris Hemsworth, Tom Hiddleston, Natalie Portman, Idris Elba and Anthony Hopkins and will be directed by Alan Taylor.
"Thor 2" film will hit the US theatres on November 15, 2013.