“While Mary Margaret and David celebrate the naming of their son at a coronation in Granny's Diner, Emma and Hook are pulled into Zelena's time portal and find themselves in the Enchanted Forest of the past,” the synopsis reads. “But in their quest to discover a way back, they must be careful not to change ANYTHING or risk altering the lives of their friends and family — as well as their very own existence.”
Click through to see more photos from the dramatic two-hour finale!
Once Upon a Time airs Sunday nights at 8 p.m. ET on ABC.