Four actors are on board for a new "Scooby-Doo" animated movie, according to The Hollywood Reporter, which has named Gina Rodriguez, Tracy Morgan, Will Forte and Frank Welker as the project's first known voice actors.

Velma, Shaggy, and Scooby-Doo have been cast ahead of May 2020's animated crime-solving comedy, per The Hollywood Reporter.

Gina Rodriguez of "Carmen Sandiego" and "Annihilation" is to play clever detective Velma, Will Forte of "Gravity Falls" and "The Last Man on Earth" becomes fearful, unkempt slacker Shaggy, and dedicated voice actor Frank Welker ("Transformers," "Trollhunters," "The Garfield Show") returns to his traditional role as oversized talking dog Scooby-Doo.

The film also provides a way for Warner Bros to introduce the larger Hanna-Barbera cartoon universe.

As a result, Tracy Morgan is to play Captain Caveman, notably not part of the original Scooby-crew, but here involved in an alliance against Dick Dastardly of "Wacky Races" and "Dastardly and Muttley" fame.

That leaves the characters of Daphne and Fred yet to be disclosed.

Tony Cervone of "The Looney Tunes Show," "Tom and Jerry Tales" and "Duck Dodgers" is to direct.

Frank Welker has been with the "Scooby-Doo" franchise since its debut in 1969, where he played blonde-haired, square-jawed, white-shirted team leader Fred Jones, later becoming the voice of Scooby-Doo himself in 2002.