Exclusive

First Look: The Simpsons' Bart [Spoiler]s Family Guy's Stewie!

We already know that when The Simpsons meet Family Guy’s Griffins in Sunday’s Smashtacular (9/8c on Fox), dads Homer and Peter mix like short-shorts and a fat dude. But how do les enfants terribles Bart and Stewie get on?

PHOTOS The Simpsons Meets Family Guy: Check Out 13 Images From the Crossover Episode

In this exclusive clip, that question is answered, and the answer is “famously.” Bart, with his spiky ’do and old-school high jinks, utterly charms his Quahog counterpart.

Not only that, but the video also serves up behind-the-scenes footage of Family Guy executive producer Rich Appel working with Nancy Cartwright as she pulls out — in quick succession — her voices for Bart, Nelson, Ralph and more.

Press PLAY below, then hit the comments with your hopes for the crossover!