I do not own Once Upon a Time or Once Upon a Time in Wonderland. Only this story. This is the fourth and final story in my "Crossing Worlds" series. It is suggested that you read the other stories before continuing, but it is not strictly necessary as there will be brief summaries of past events as needed. This story may contain spoilers for Once Upon a Time Season 5. Enjoy!

Chapter 1: New Missions

Wonderland

Queen Anastasia awoke next to her fiancé Will Scarlet. It was their first night back in Wonderland since it was liberated from Hades' demon armies. They looked forward to rebuilding the kingdom with hope once again. Ana was about two months pregnant with her and Will's first child. It was crucial that Will and Ana get married before the baby's birth, so that the baby would be seen as a "legitimate" heir to the throne of Wonderland. One strategy in brining peace back to Wonderland was insuring an easy line of succession. Ana and Will got out of bed and walked over to the open window. From their bedroom at the top of the royal castle, they looked down at their kingdom as the sun was rising for a new day. Suddenly, a small yellow bird flew in the window, dropped a piece of paper in the center of the room and then flew back outside. Curious, Ana and Will walked to the center of the room and picked up the paper. This was a note, from the grand wizard Merlin.

"To the King and Queen of Wonderland." The note read. "I've sent this to you because I have no other option. A great evil is coming that threatens every magical world. I remain trapped and am unable to confront this evil myself. I had just enough power to send this note to you from Camelot. I am asking for your help. Long ago, there was a magic dragon, whose power was god -like. Eventually, the dragon died, but it's power remained. Six of the dragon's claws were removed from its corpse by villains hoping to channel the power of this dragon through them. They turned those claws into powerful swords. I defeated the villains and scattered the swords across realms. I need you to retrieve them. Once you find the first, it will lead you to the second. Once you make your way to Camelot, use the swords to release me from my prison. I wish this wasn't the situation, but it is. I pray that you will take this mission. The first sword is here in Wonderland."

After reading the note, Will and Anastasia looked at each other. Neither of them wanted to take on Merlin's mission. They had just settled down again and they needed to focus on building Wonderland and their family. However, they were heroes. They couldn't just let this go. They both silently agreed to take on the mission and to stay by each other's side through it all.

Camelot

The Wicked Witch appeared in a cloud of magic smoke in the forest outside Camelot. She had her magic slippers and, more importantly, the Dark One's dagger. However, the Dark One was no longer Rumplestiltskin. Moments ago, the darkness passed into a new host, Emma Swan. Zelena needed to talk to Merlin, but first she needed to retrieve her new slave. Zelena had to go find the Dark One. On the other side of the forest, the evil sorcerer Jafar had appeared as well. He had a similar mission as the Wicked Witch. Jafar needed to get to Merlin as well. Neither villain knew that the other was there. In the past, on more than one occasion, Jafar and Zelena had been allies. Now, they are enemies. They would soon engage in a race to find the most powerful wizard who ever lived, Merlin.

Storybrooke

A wave of fear swept over everyone on Main Street. It was night and the moon glowed over the small magical town. After returning from the Underworld having just killed Hades, a new danger threatened Storybrooke. Regina, Mary Margaret, David, Hook, Maleficent, Belle, Alice, Cyrus, Taj, Rafi, and Sophia had just watched Emma consume all the dark power from Rumplestiltksin, becoming the next Dark One. Then, they were powerless to stop the Wicked Witch from taking the Dark One's dagger and disappearing to an unknown location. Emma was now lost to them. Before they even had time to think, the most powerful among them had a terrifying premonition. As children of Hades, Cyrus, Taj, and Rafi all had the power of the gods. Cyrus' now sixteen year old daughter Sophia had this power as well. They felt that a great evil was coming to Storybrooke tonight, and they were right. Cora had assembled an army and was on her way to Maine to invade Storybrooke, take its magic, and destroy all who stand in her way. Mr. Gold had just woken up from his slight coma and walked onto Main Street to see the heroes in a great confusion.

"Emma is more important than Cora!" Mary Margaret yelled.

"I disagree." Regina said firmly. "We can find Zelena and save Emma any time. We always do. If we abandon Storybrooke now, we won't have a home to come back to."

"I won't give up on her." Mary Margaret said.

"Neither will I." David said.

"No one is asking you to." Alice said. "I propose we split up. Some will stay here and fight Cora and the others will fight Zelena and save Emma."

"We don't even know where Emma is." Hook said.

"I do." Mr. Gold said.

"Rumple!" Belle yelled with excitement. "You're alive!"

"Where is she!" David yelled.

"She will appear at the Vault of the Dark One." Gold said. "We'll have to hurry if we want to get there before Zelena."

"My son is here." Regina said. "He's back at the Charmings' apartment. I won't leave him to face my mother alone. I'm staying."

"Cyrus, Sophia, and I are staying here." Alice said. "They have the power of the gods and I won't be split up from my family again. With them in Storybrooke, I'm sure we can defeat Cora."

"Mary Margaret." David said. "Why don't you stay here? I'll find our daughter. You need to stay here to keep our son safe."

Mary Margaret wanted to protest, but knew that David's logic was sound. She was a mother of two and it would be irresponsible to leave her baby in Storybrooke when it was about to be under attack by an evil witch.

"I'm going with you to find Emma." Hook said.

"Good luck." Regina sarcastically said. "You two don't have magic. How do you expect to fight the Wicked Witch and the Dark One?"

"With our help." Taj said. "Rafi and I will go with them."

"You'll need me to go too." Gold said. "I'm the only one who knows exactly where the vault is."

"You just don't want to stay here and face my mother." Regina said.

"I'm coming with you." Belle said.

"No." Rumple said. "I don't have my magic anymore. I can't protect you."

"Will I be protected here?" Belle asked, hoping to convince him that she wouldn't really be safe anywhere, so she might as well be with him.

"Yes." Gold replied. "This town is full of magical places you can hide."

"Well good luck to you all." Maleficent said. "I'm not helping either of you. The only thing I care about is finding my children."

The Dragon Queen then disappeared in a cloud of magic smoke on a mission to find her daughter in Massachusetts and her son in Camelot.

"Great." Cyrus sarcastically said. "What will we do without her power?"

Suddenly, another cloud of magic smoke appeared, revealing Glinda, the Witch of the South.

"Use my power." Glinda said. "I have it back now. The Dark One stole my pendant from me. Now that his power is gone, it was magically returned to me. I know of Cora's invasion and that Zelena has taken Emma. I will help in any way I can."

"Come with us." Hook said. "You know Zelena better than anyone."

"How will we get to the Enchanted Forest?" Glinda asked.

"I'll take us there." Rafi said. "With the power of the gods, I can take us to any world without portals or curses. Good luck to you all. We will return once we have rescued Emma."

Rafi then waved his arm. Then, a magic cloud of smoke consumed him, Taj, Glinda, Mr. Gold, Hook, and David. They disappeared on a mission to save Emma, leaving Regina, Alice, Cyrus, Sophia, Mary Margaret, and Belle to face Cora. They hoped they would be enough to stop her.

New Hampshire

Cora's bus had just crossed the state border from Massachusetts into New Hampshire. She was so close to Storybrooke. Behind her large black bus were a series of jeeps carrying soldiers from England. They were ready to kill on her command. Cora sat on the couch inside the bus, waiting. On the couch across from her, Alice's twin sister Victoria lay dying. She was stabbed only moments ago and was trying to stop blood from pouring out of her stomach. Now that Victoria had no magic, Cora didn't bother trying to save her. She had more important things to do, like plan who she was going to kill first. What Cora and Victoria did not know was that they were being watched by a powerful god on Mount Olympus.

Olympus

Zeus sat in his throne room and watched as Cora moved towards Storybrooke. He was thousands of years old, but looked to be in his late forties. A few gray hairs showed through his short, brown beard. As he watched Cora, he started to form a brilliant idea. His brothers Poseidon and Hades had been murdered and Zeus was out to punish those responsible. Cyrus, Taj, and Rafi had killed their father Hades along with their fourth brother Iago. As far as Zeus knew, the three brothers were still in Storybrooke. Zeus then concluded that this was the perfect opportunity to get his revenge.