SIDNEY ASKS EMMA TO HELP HIM EXPOSE THE CORRUPTION THAT MAYOR REGINA HAS UNLEASHED ON STORYBROOKE, AND KING LEOPOLD MUST BE CAREFUL WHAT HE WISHES FOR WHEN HE IS GRANTED THREE WISHES BY A GENIE, ON ABC'S "ONCE UPON A TIME"

Richard Schiff ("The West Wing") Guest Stars as King Leopold

"Fruit of the Poisonous Tree" - A dejected Sidney enlists the aid of Emma to help uncover evidence that could expose Mayor Regina as the corrupt person she really is to the townspeople of Storybrooke; and Mary Margaret and David continue their secret rendezvous while trying to figure out a way to unleash their unrequited love. Meanwhile, back in the fairytale land that was, King Leopold (Richard Schiff), who is the father of Snow White and married to the Evil Queen, stumbles upon a magic lamp and is granted three wishes by a Genie - who warns the king to be careful what he wishes for -- on "Once Upon a Time," SUNDAY, JANUARY 29 (8:00-9:00 p.m., ET) on the ABC Television Network.

"Once Upon a Time" stars Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Robert Carlyle as Rumplestiltskin/Mr. Gold, Lana Parrilla as Evil Queen/Regina, Jared Gilmore as Henry Mills, Josh Dallas as Prince Charming/David and Raphael Sbarge as Jiminy Cricket/Archie Hopper.

Guest starring are Tony Perez as valet, Giancarlo Esposito as Sidney/Magic Mirror, Eion Bailey as stranger, Richard Schiff as King Leopold and David Bloom as Mr. K.

"Fruit of the Poisonous Tree" was written by Ian Goldberg & Andrew Chambliss and directed by Bryan Spicer.

"Once Upon a Time" is broadcast in 720 Progressive (720P), ABC's selected HDTV format with a 5.1 channel surround sound. A TV parental guideline will be assigned closer to the airdate.

For more information on "Once Upon a Time," visit ABC.com/Once