Geoffrey Rush on board for supporting role.

THR has learned that Gerard Butler (‘Olympus Has Fallen,’ ‘Chasing Mavericks,’ ‘300’) is being lined up to star opposite Nikolaj Coster-Waldau (‘Game of Thrones,’ ‘Mama’) in the Alex Proyas-directed fantasy epic ‘Gods of Egypt.’

Featuring a script by Burk Sharpless and Matt Sazama, the story is set in the aftermath of when one ruling god, Set (Butler), the god of the desert, kills another, Osiris. When Osiris’ son Horus (Coster-Waldau) fails in his attempt to get revenge and has his eye plucked out, it’s up to a young human thief in love with a slave to help defeat the angry god.

The trade adds that Geoffrey Rush (‘The Book Thief,’ ‘The Pirates of the Caribbean’) is attached to play the sun god Ra, the father of Set and Osiris who is also Set’s ultimate target.

Filming is set to begin early next year in Australia with Thunder Road head honcho Basil Iwanyk producing alongside Proyas.