'The Simpsons' and 'Family Guy' are crossing over in September

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Though it was first revealed in 2013, next to nothing has been said about the crossover event between "Family Guy" and "The Simpsons." At FOX's 2014 upfront presentation though, they spilled the beans.

"The Simpsons Guy" will air in September as an hour-long crossover event. A section of footage was shown to advertisers and press in attendance, but hasn't appeared online yet.

It's unclear what the special's story will be, but from two screengrabs of the footage (via Mashable) it's easy to see that Stewie and Bart may get along, but Homer and Peter certainly don't.

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Photo/Video credit: FOX