VIDEO: Sneak Peek of Upcoming ONCE UPON A TIME

ONCE UPON A TIME's second season is starting off strong - it's newest episode,"The Doctor "is set to air this Sunday on ABC. Check out a sneak peek below!

"The Doctor" - While Regina continues to try and stop using her magic in an attempt to win back Henry's affections, she begins seeing what she believes is a ghost from her past; and when Mary Margaret and Emma discover a lone survivor from an ogre massacre, Emma begins to question whether or not he's telling the truth. Meanwhile, in the fairytale land that was, Regina finds herself failing at learning the dark arts from a dark master because something from her past is preventing her from using her magic for evil, on "Once Upon a Time," SUNDAY, OCTOBER 28 (8:00-9:00 p.m., ET) on the ABC Television Network.