Ultron serves as the major villain in "Avengers: Age Of Ultron," but Earth's Mightiest Heroes may confront another former foe in the upcoming sequel.

Idris Elba, who plays Asgard gatekeeper Heimdall, revealed he and Tom Hiddleston's Loki would make an appearance in the next anticipated Marvel film.

"I'm in 'Avengers,'" Elba told The Telegraph and acknowledged he may have been speaking out of turn. "And I'm doing a scene with Chris Hemsworth [who plays Thor] and Tom Hiddleston, and they're like, [whispers] - 'Aren't you [meant to be] in Ibiza?'"

The "Luther" star held a nine-week summer residency as a DJ in Ibiza but sneaked away from his musical duties for a couple days to shoot the "Avengers 2" scene outside London with his "Thor" co-stars.

Elba and Hiddleston did not appear in the first "Avengers" trailer that leaked and then Marvel released on Oct. 22. Both last appeared in the 2013 film "Thor: The Dark World."

That sequel proved difficult for Elba, who had trouble transitioning from his role as Nelson Mandela back to filming re-shoots for "Thor 2." Elba spent eight months in South Africa as the anti-apartheid revolutionary for the 2013 film "Mandela: Long Walk to Freedom." He then found himself back in London, hanging upside down in front of a green screen for "The Dark World."

"I was like, 'This is torture, man. I don't want to do this.' My agent said: 'You have to, it's part of the deal,'" he said. "I'm actually falling down from a spaceship, so they had to put me in harness in this green-screen studio. And in between takes I was stuck there, fake hair stuck on to my head with glue, this f------ helmet, while they reset. And I'm thinking: '24 hours ago, I was Mandela'."

Elba will next star in the films "Beasts of No Nation" and "The Gunman." He'll also star as Shere Khan in Jon Favreau's live-action "The Jungle Book" movie.