Transformers: Boredom of Optimus Prime

(There don’t seem to be any cons left for prime to kill so I'll bet he's bored out of his processor)

Better yet

Transformers: Optimus Snaps

(The plot to the movie is optimus (due to boredom) goes nuts and thinks that all the autobots are decepticons and kills all of them (except bumblebee)

Sam Witwicky the movie
Featuring Bumblebee and Optimus prime

But in all seriousness it'll probably be something like Transformers: Birth of Galvatron or something like that