The movie, starring Sean Astin, Josh Brolin and Corey Feldman, tells the story of a group of children who go in search of a pirate's treasure and the story has now been re-written as a song-and-dance stage show.
Donner admits transforming the film into a musical has been a long, arduous process, but he's convinced the show will be a hit.
He tells Empire, "It's been taking forever, but that long process just got a lot shorter. There's a great writer/producer called Tim Long who does musicals on The Simpsons which are classic. He just delivered a treatment of The Goonies as a musical, and it's friggin' great!"