WATCH: Sneak Peek of all-new AMERICAN DAD - "Adventures in Hayleysitting"

AMERICAN DAD: Stan and Francine reluctantly let Hayley babysit Steve in the all-new "Adventures in Haleysitting" episode of AMERICAN DAD airing Sunday, Dec. 9 (9:30-10:00 PM) on FOX 50. AMERICAN DAD ™ and © 2012 TCFFC ALL RIGHTS RESERVED.

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By FOX50.com

Story Created: Dec 6, 2012 at 3:32 PM EDT

Story Updated: Dec 6, 2012 at 3:32 PM EDT

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The Smith family’s regular babysitter, Lindsay (guest voice Alison Brie), breaks her leg in a soccer match. So Stan and Francine are forced to leave Steve with Hayley, despite her track record of being extremely irresponsible.

When Hayley teases Steve about being a goody-two-shoes, Steve is determined to prove her wrong and sneaks out of the house to go to a party with the cool kids in the all-new “Adventures in Hayleysitting” episode of AMERICAN DAD airing Sunday, Dec. 9 (9:30-10:00 PM) on FOX 50. (DAD-709) (TV-14 D, L, S, V)

Voice Cast: Seth MacFarlane as Stan Smith and Roger the Alien; Wendy Schaal as Francine Smith; Rachael MacFarlane as Hayley; Scott Grimes as Steve; Dee Bradley Baker as Klaus; Jeff Fischer as Jeff.

Guest Voice Cast: Sarah Michelle Gellar as Jenny, Alison Brie as Lindsay and Charlie Day as Jon.