Mckenna Grace and Iain Armitage will voice young Daphne and Shaggy in 'Scoob.'

Scoob, the animated Scooby-Doo feature from Warner Bros., is adding two young stars to its A-list voice cast. Mckenna Grace, who played a young Carol Danvers in Captain Marvel, and Young Sheldon star Iain Armitage will join the production as a young Daphne and Shaggy. Amanda Seyfried and Will Forte will be voicing their grown-up counterparts. Gina Rodriguez will play Velma, Zac Efron will voice Fred, and veteran voice actor Frank Welker will play the titular canine. Tracy Morgan, Mark Wahlberg, Ken Jeong and Kiersey Clemons will also lend their voices to the feature.

Tony Cervone is directing, with Chris Columbus and Allison Abbate serving as producers. Charles Roven and Richard Suckle are executive producers. Scoob will see the Mystery Inc. gang join forces with other heroes of the Hanna-Barbera universe — including Blue Falcon, Captain Caveman and Dynomutt — to save the world from Dick Dastardly and his evil plans. And this time, we are told, the threat is real. The movie is slated for a May 2020 release.