OUAT/VD/Originals: Moments In Time (Klatherine)

Full summary: Set in Originals S5, VD S8, and OUAT S2-5. After Klaus dies, he ends up in the Enchanted Forest, being almost fully taken over by The Hollow. Because he's alive again in the Enchanted Forest, so is The Hollow. When Kat ends up there after Stefan died with her in S8, she stumbles upon what's going on with Klaus. Can she get him to Rumple for help, before The Hollow fully takes him over? Will Hook be persuaded to help them get out of the fairytale world? What will ensue, once they're in Storybrooke? Will they ever find their way back to their own world? Will something more than frenemies ensue between Klaus and Kat?