Chris Hemsworth's superhero alter-ego Thor is set to team up with his evil brother Loki in the Thor sequel, The Dark World.
Despite Loki (Tom Hiddleston) being behind bars, Thor decides to consult him for advice, and the pair are seen talking in the film's first trailer, which has been shown by Marvel Studios.
"You must be truly desperate to come to me for help," Loki said, to which Thor replied: "You should know when you betray me, I will kill you."
Loki then added: "When do we start?"
Natalie Portman, Sir Anthony Hopkins and Idris Elba return alongside Stellan Skarsgard, Kat Dennings and Christopher Eccleston for the sequel, which has been directed by Game Of Thrones' director Alan Taylor.
The follow-up to the 2011 action film sees Thor battling to save all nine realms from Malekith the Accursed (Eccleston), who wants to plunge the world into darkness.