"This seems like a one-shot deal," warns Brian in the extended trailer for The Simpsons-Family Guy crossover episode. Well then, we better savour the collision of the Simpson and Griffin families while it lasts.

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The five-minute promo for the upcoming episode, helpfully titled "The Simpsons Guy", features Homer Simpson and Peter Griffin bonding over a shared love of doughnuts, before falling out spectacularly over their choice of beer.

The battle over Duff Beer and Patriot Ale escalates, leading to a full-on fight scene ending in nuclear meltdown and interstellar warfare – naturally.

Elsewhere, Bart introduces Stewie to the joys of the prank call and Brian warns his family not to drink the water because "Everybody around here looks like they have hepatitis."

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The episode will premiere in September, with a UK broadcast due on Sky 1.

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