You may have thought you met Quagmire's mom, but she's never sounded like this before!

No, really. On Sunday's all-new Family Guy (9/8c, Fox), Mom star Allison Janney lends her voice to play Quagmire's mom, who was previously voiced by cast member Alex Borstein. In the episode, Peter decides to throw a party, during which Quagmire gets in trouble (as always).

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Quagmire lands in court to defend himself, but why is he calling his mom a "sexual deviant" in front of the jury? Check out this exclusive sneak peek from Sunday's episode to find out:

Family Guy airs Sundays at 9/8c on Fox.