The mash-up of the century.

Looks like The Simpsons wild child Bart will be taking Family Guy‘s Stewie Griffin under his mischievous wing this fall when Fox brings their animated families together.

Fox teased The Simpsons Guy hour-long crossover episode with a short clip of Bart Simpson and Stewie Griffin skateboarding in Springfield. It also showed their fathers, Homer and Peter. You still have to wait a few months for the episode. The mash-up episode will debut in September, Fox Entertainment Chairman Kevin Reilly confirmed Monday during Fox’s annual upfront presentation.

“Generations of fans will be talking about this one,” Reilly said in New York City.