ONCE UPON A TIME Season 1 Episode 20 The Stranger Promo : “The Stranger” – August promises to enlighten Emma and take her on a journey that will show her how she can beat Regina, and possibly take custody of Henry; and with Mary Margaret returning to work, Regina puts a plan in motion to seduce David. Meanwhile, in the fairytale land that was, with the Evil Queen’s curse about to strike, Geppetto agrees to a plan that will save Snow White and Prince Charming’s daughter, but with a proviso that could also save his own son, on “Once Upon a Time,” SUNDAY, APRIL 29 (8:00-9:01 p.m., ET) on the ABC Television Network.