On Once Upon a Time Season 5 Episode 13, Mary Margaret thinks an old friend can help them find Hook who is being held captive and guarded by a beast.

On Once Upon a Time Season 5 Episode 12, as the heroes try to rescue Hook, they learn that the inhabitants of the Underworld have unfinished business with them.

On Once Upon a Time Season 5 Episode 11, Emma refuses to give up even as all of the Dark Ones descend upon Storybrooke looking to take a soul.

On Once Upon a Time Season 5 Episode 10, Emma attempts to persuade Hook to fight the darkness within him but his vengeance against Gold is reawakened.

On Once Upon a Time Season 5 Episode 9, Zelena and Arthur journey to find a relic to help vanquish Emma but run into Merida, Mulan, and Ruby along the way.

On Once Upon a Time Season 5 Episode 8, Arthur uses Merlin to deliver and ultimatum to Emma. Hand over the dagger and the spark or lose her entire family.

On Once Upon a Time Season 5 Episode 7, Merlin and Emma journey to confront to the sacred spark but encounter the first Dark One along the way.

On Once Upon a Time Season 5 Episode 6, in Camelot, Merida and Belle head out on a dangerous journey while back in Storybrooke, Emma orders Belle to be killed.

On Once Upon a Time Season 5 Episode 5, Emma and Regina try to free Merlin while back in Storybrooke, the heroes get a glimpse at Emma’s end game.

On Once Upon a Time Season 5 Episode 4, Mary Margaret must take matters into her own hands when she realizes Arthur may be the heroes’ biggest threat.