Last year, it was revealed that Disney-Pixar is developing a sequel to the animated superhero comedy The Incredibles, and now director Brad Bird has revealed that he has started work on the screenplay for The Incredibles 2, telling NPR’s Ask Me Another that: “It’s percolating. I mean, I’m just starting to write it, so we’ll see what happens.”

Released in 2004, The Incredibles grossed over $630 million worldwide, and received the Academy Award for Best Animated Feature, as well as Best Sound Editing. The follow-up is one of several Pixar sequels in the works as Disney, with Finding Dory set to arrive in 2016, Toy Story 4 in 2017, and Cars 3 at an unspecified future date.

SEE ALSO: Samuel L. Jackson says Frozone will return for The Incredibles 2

Bird is currently putting the finishing touches to Disney’s live-action sci-fi Tomorrowland, which opens on May 22nd, with a cast that includes Britt Robertson (Under the Dome), George Clooney (Gravity), Hugh Laurie (House), Raffey Cassidy (Snow White and the Huntsman) and Thomas Robinson (The Switch).