Once Upon a Time Season 4
A Tale of Two Sisters
White Out
Rocky Road
The Apprentice
Breaking Glass
Family Business
The Snow Queen
Smash the Mirror Parts 1 & 2
Fall
Shattered Sight
Heroes and Villains
Darkness on the Edge of Town
Unforgiven
Enter the Dragon
Poor Unfortunate Soul
Best Laid Plans
Heart of Gold
Sympathy for the De Vil
Lily
Mother
Operation Mongoose
Season 4 brought with it lots of challenges and sacrifices. In order to avoid any spoilers, I'm just listing the episode titles here. :)