T.A.W.O.G and Clarence Crossover is a TV Film that might be released in 2016 or 2017.
When Gumball finds out there's an evil guy named Demon Shotgun, He helps Darwin and his friends to save the world with Clarence, Jeff & Sumo.
The TV Film might be by Paramount Pictures, Warner Bros. Animation, And Cartoon Network Studios.
Blu-Ray & DVD Release Date Edit
It is unknown when it will come on DVD/Blu-Ray.