VIDEO: Watch Ian McKellen Guest Star On Sunday's Episode of FAMILY GUY

Stewie (Seth MacFarlane) gets sent to see his school's child psychologist, Dr. Cecil Pritchfield (guest voice Sir Ian McKellen), for a surprising session, which causes Stewie to reveal major, never-before-told SECRETS about himself in the all-new "Send in Stewie, Please" limited commercial episode of FAMILY GUY airing Sunday, March 18 (9:00-9:30 PM ET/PT) on FOX.

Entering its 15th season, FAMILY GUY continues to entertain its die-hard fan base with razor-sharp humor, spot-on parodies, spectacular animation and orchestra-backed original music. Since its debut, the series has reached cult status among fans, and its breakout star, a talking baby, has become one of the greatest TV characters of all time. Meanwhile, THE FAMILY dog's untimely death (and resurrection!) made worldwide news. FAMILY GUY has racked up numerous awards, including an Emmy Award nomination for Outstanding Comedy Series, only the second animated series in television history to be honored with such a distinction.

The series' creator and lead voice actor, Seth MacFarlane (voice of "Brian Griffin," "Peter Griffin" and "Stewie Griffin"), recently received a 2014 Emmy Award nomination for Outstanding Voice-Over Performance. FAMILY GUY follows the adventures of lovable oaf PETER GRIFFIN (Seth MacFarlane) and his hilariously odd family of middle-class New Englanders. LOIS (Alex Borstein) is Peter's loving wife, a former Miss Teen Rhode Island who rules the roost but is one step away from a nervous breakdown. Then there are their kids: frumpy, 16-year-old MEG (Mila Kunis), the family's punching bag; 13-year-old CHRIS (Seth Green), a kid who can't make sense of the opposite sex, much less the evil monkey hiding in his closet; and 1-year-old STEWIE (MacFarlane), a diabolically clever baby whose heterosexuality is hanging by a thread. Rounding out the Griffin household is BRIAN (MacFarlane), THE FAMILY dog, a member of Mensa with a penchant for dry martinis and dumb blondes.

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