PA: Viewer discretion is advised.

LOIS TIPS THE SCALE ON "FAMILY GUY" SUNDAY, JUNE 11, ON FOX

After a pregnancy scare, Peter reluctantly agrees to get a vasectomy. But after the operation, Peter's sex drive becomes nonexistent. When Lois packs on some extra pounds, Peter's interest is renewed and things heat back up in the bedroom until her unhealthy eating habits get the best of her. Meanwhile, Stewie's half-brother and archrival Beltram confronts him and they declare an all-out war for control over the playground in the "Sibling Rivalry" episode of FAMILY GUY Sunday, June 11 (9:00-9:30 PM ET/PT) on FOX. (FG-424) (TV-14 D, L, S, V)

Voice Cast: Seth MacFarlane as Peter Griffin, Stewie Griffin, Brian Griffin, Quagmire; Alex Borstein as Lois Griffin; Seth Green as Chris Griffin; Mila Kunis as Meg Griffin; Mike Henry as Cleveland and Cleveland Jr.

Guest Voice Cast: Danny Smith as A; Wallace Shawn as Bertram, Ralph Garman as Caveman #1; Patrick Warburton as Joe; Phil Lamarr as Man; John Viener as Morgan Freeman and Sylvester Stallone; Chris Sheridan as Prisoner #2 and Waiter; Nicole Sullivan as Receptionist; Tara Strong as Tatum and Zack; Alec Sulkin as Tony Danza and Wally Wingert as U.