Geoffrey Rush admits that he had not heard of Green Lantern when he agreed to voice the character of Tomar-Re.
The actor lends his voice to this summer's big budget blockbuster, which sees Ryan Reynolds take on the title character.
Directed by Martin Campbell the film also stars Blake Lively, Peter Sarsgaard and Mark Strong.
Speaking to Screen Rant the actor said: "I didn't know about [the Green Lantern comic book series]. In terms of DC comics I was a Superman reader in my childhood and adolescence.
"I was not at all familiar with Green Lantern. In fact, I don't know if in Australia it was... it was never in broad popular culture.
"It may not have been here, it might have been a niche kind of obsession in the States. No, they showed me the artwork for it and I just said I'd love to be that guy."
Rush has already achieved critical acclaim this year for his performance in The King's Speech - for which he was Oscar nominated.
He is also set to return to the role of Barbossa later this month with Pirates of the Caribbean: On Stranger Tides.
The Green Lantern is released 17th June.
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