Idris Elba might be in trouble with Marvel after spilling a big "The Avengers: Age of Ultron" casting secret in an interview with The Telegraph published Sunday, Nov. 2.

The 42-year-old British actor revealed to the newspaper that he will be reprising his role as Heimdall in the sequel, and that Loki will also appear. "I'm in 'Avengers: [Age Of Ultron']," he said. "And I'm doing a scene with Chris Hemsworth (Thor) and Tom Hiddleston (Loki)."

Marvel is super secretive about its films' plot details and character cameos, especially when it comes to fan-favorite characters like Loki, according to EntertainmentWise. So it is expected that the film studio will get the attention of the "Pacific Rim" actor about the matter.

In a new interview with Vulture, "The Avengers: Age of Ultron" director Joss Whedon was asked if he has already sent a "scolding 'Tsk, tsk' email"  to the Golden Globe-winning actor after the major leak. And he answered, "Um, should he receive an email from me, there might be an attitude of scold."

When the interviewer said that Marvel Studios head Kevin Feige was in touch about the issue, the 50-year-old Oscar nominee said, "Yeah, when you have a cast of 19,000 people, inevitably, once every month, you pick up [a story] and you're like, 'Awww.'"

But Elba did not just drop a big spoiler about "The Avengers" sequel during his interview with The Telegraph, he also said that reshooting scenes for "Thor: The Dark World" was a "torture" for him.

"I'd just done eight months in South Africa," said Elba who filmed his movie "Mandela: Long Walk to Freedom" in the said country. "I came to England and the day I came back I had to do reshoots on 'Thor 2.' And in the actual scene my hair was different.  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 went on to describe the scene he was reshooting. "I'm actually falling down from a spaceship, so they had to put me in harness in this green-screen studio," he recalled. "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.' Then there I was, in this stupid harness, with this wig and this sword and these contact lenses. It ripped my heart out."

"The Avengers: Age of Ultron" is slated to hit theaters on May 1, 2015.