Michael Douglas may never let this one go.

The 70-year-old actor has revealed that the one movie he ever passed on was...Disney's 2013 hit Frozen. Which made more than $1.2 billion worldwide.

"When you talk about the pictures that you turn down...I have nothing I turned down except there was one animation picture, just a voiceover, that would have been more profitable for me than any picture I've ever done," Douglas, sitting beside a grinning Simon Cowell, said on The Late Late Show With James Corden on Thursday, before whispering "Frozen."

Douglas, who has in the past done voiceover work on animated shows such as Phineas and Ferb, said he didn't remember which character he was supposed to play. Disney has not commented.

Frozen's young, strapping male characters include Kristoff (Jonathan Groff) and Hans (Santino Fontana), while the movie also features older men such as the Duke of Weselton (Alan Tudyk) and Oaken (Chris Williams). And, of course, the King of Arendelle (Maurice LaMarche), father of main characters Elsa (Idina Menzel) and Anna (Kristen Bell).

"I would love to hear Michael Douglas singing "Let it Go," host James Corden said.