Once Upon a Time Mega Buzz: Regina's Dark Side Comes Out in the Underworld

The team of heroes quickly realizes that the Underworld is a twisted version of Storybrooke, populated by people with unfinished business - most of it with the core group that just showed up.

[...] while Regina isn't tempted to feed anyone any poisonous apples, a family reunion with her mother Cora (Barbara Hershey) will force her to make a tough decision between helping her friends and saving someone she loves (and herself).