Pixar’s The Good Dinosaur has had its share of production problems in the past. The first sign of trouble was when Bob Peterson was a no-show at D23 Expo in 2013. Due to some issues with the story, Peterson was taken off the project, and replaced by Peter Sohn (Pixar animated short Partly Cloudy). At the time, the film had already cast its voice talent, which consisted of Lucas Neff (Raising Hope), John Lithgow, Frances McDormand, Neil Patrick Harris, Judy Greer, and Bill Hader.

But we are now learning that The Good Dinosaur is getting a major voice cast overhaul, and everyone except McDormand has been replaced. Some of the incoming talent includes, Anna Paquin, Sam Elliott, Jeffery Wright, Steve Zahn, and more. Check out the new cast below.

“This is the biggest ‘what if?’ ever,” John Lasseter said today at the Animation panel at this year’s D23 Expo in Anaheim, CA, in describing Disney/Pixar’s animated feature The Good Dinosaur. Most Pixar films start off with big questions, he said, and The Good Dinosaur is no exception. Footage was shown, and details about the characters and who’d be voicing them were announced.

The main character is Arlo the Apatosaurus, as voiced by Lucas Neff. Other characters in the film include members of Arlo’s family: John Lithgow as Poppa, Frances McDormand as Momma, Bill Hader as older brother Forrest, Neil Patrick Harris as brother Cliff, Judy Greer as sister Ivy, and then there’s Neff as Arlo. Hader, Greer and Neff came out onto the stage, having just met one another.