Elba will play Duncan, Man-At-Arms in the upcoming Travis Knight-directed film for Amazon MGM and Mattel Films, Deadline reports.
Idris will be joining a star-studded cast, with Nicholas Galitzine already on board as He-Man, Camila Mendes as Teela, and Alison Brie as Evil-Lyn.
Bumblebee helmer Knight is directing from a script by Chris Butler, although exact plot details are yet to be revealed.
Masters of the Universe was introduced to the world via action figures in 1982 and focused on the battle between the heroic He-Man and the evil Skeletor.
The animated series He-Man and the Masters of the Universe premiered the following year and several other film and TV adaptations have followed since as the franchise is still going strong.
The movie is slated for release in June 2026 after enduring a two-decade journey to the big screen.
It was axed by Netflix in 2023 due to budget concerns while directors John Stevenson, Jon M Chu and McG have all been attached to the project since 2007.
"We're thrilled to bring the beloved Masters of the Universe to life and couldn't be more excited to announce the immensely talented Nicholas Galitzine as our He-Man," Julie Rapaport, head of film production and development at Amazon MGM Studios, said in a statement following Galitzine's casting.
"Joining forces with director Travis Knight, Mattel and Escape Artists, this reintroduction of the character and his universe will be an epic film that will delight audiences from here to Eternia."
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