The Hollywood Reporter :

Last Man on Earth star Will Forte, Jane the Virgin star Gina Rodriguez, Tracy Morgan and Frank Welker are going for a ride in the Mystery Machine.

The actors have closed deals to voice star in the untitled Scooby-Doo animated movie being made by Warner Bros. and its Warner Animation Group division.

I love all three of those guys! But who are they playing?

Rodriguez will voice Velma, known as the brains of the group. Forte will voice Shaggy, the scaredy-cat slacker who is best friends with Scooby. Morgan will voice a character not part of the Scooby universe, but rather part of the larger Hanna-Barbera cartoon universe, Captain Caveman.

…wait what…

Morgan will voice a character not part of the Scooby universe, but rather part of the larger Hanna-Barbera cartoon universe, Captain Caveman.

OH HELLS YEAH