Mystery Solvers Unite!

Mystery Solvers Unite! is an animated crossover film produced by Warner Animation Group as the tenth film in the Warner Bros. Hanna-Barberaverse. It is a crossover featuring various Hanna-Barbera characters.

Plot
When we last left George Jetson, he went back in time to retrieve his old friend Rosie the Robot who ran away from the family. But when he finally reached his destination, he was shocked at what he saw: people running in terror as Dynomutt and the Blue Falcon battled--and eventually got abducted by--Rosie's new master, the mysterious Mr. Hyde. Evading capture with help from living vehicle Speed Buggy, Jetson races against the clock to assemble various citizens who he believes could help him. Joining him on his quest are Great Dane detective Scooby-Doo, air-breathing shark Jabberjaw, prehistoric superhero Captain Caveman and crafty schemers Tom and Jerry. Their mission is to find Mr. Hyde, free Rosie from his clutches and save the town--and possibly the world--from danger. Sounds like a walk in the park!

Cast

 * Frank Welker as Scooby-Doo, Jabberjaw, Tom, Jerry, Speed Buggy and Dynomutt
 * Jim Cummings as Captain Caveman
 * Jeff Bergman as George Jetson and Fred Flintstone
 * Ben Affleck as the Blue Falcon
 * TBD as Mr. Hyde
 * Tress MacNeille as Rosie the Robot

Trivia

 * Fred Flintstone has a cameo in the film.
 * Speed Buggy has a minor role in the film.
 * It is revealed that Rosie was forced to help Mr. Hyde because she didn't want to be destroyed, but at the same time she wasn't ready to go back home because she wanted to be more than a maid.