Season 1 episode 26- Showdown:
The Turtles just stopped the kraang invasion. They were still inside the kraang pod with Leonardo when Mikey saw a woman in a dark blue dress, standing on top of the water.
“Dude's, Look!” said Mikey. But when he looked back, she was gone.
“What is it?” asked Leo.
“Nevermind. Thought I saw something.”
Season 2 episode 17- Newtralized:
Mikey wondered who that girl was that he saw in the invasion. Maybe he was hallucinating? Or was she real?
He didn't really get to see her all that well, because she was far away. All he saw was a dark blue dress and.... floating dark blue hair? Something was definitely up. He could’ve sworn for a split second he even saw her in a dream once…
After the turtles defeated the Newtralizer, Mikey saw the woman again.
“Look look look!” he yelled. The turtles looked, and saw the woman, standing on the water.
“Whoa.” said Leo.
“Who is that? asked Raphael. “And how is she just standing on the water?”
“I don’t know,” said Mikey. “but that’s the girl that I saw after that kraang invasion!”
The woman smiled, and walked towards the turtles. With every step, a crescent moon appeared under her foot. It would disappear after a few steps. She eventually reached the dock where the turtles were located.
She had dark blue long gloves, and a short sleeved dress with a white crescent moon on the top. Her hair was also dark blue and wavy, it also was floating. She had a silver wand that she held. Her crown was black. Her high heels were light blue, and she had a horn on her head and huge wings on her back. Both were the same color of her dress.
“Hello, turtles.” she said.
“Who are you? asked Leo.
“I am Princess Luna, Princess of the night.” she said. “I need your help. I was banished to the moon for a thousand years. When I went back to my kingdom a while after I returned to earth, an evil force called the tantibus was attacking it. I couldn’t stop it on my own. I cast a spell for me to be sent to strong warriors who would help, and I was sent here.”
“What is a tantibus? asked Donatello.
“It was a blue mist that gave me my nightmares from when I turned into Nightmare Moon, when I was evil.” said Luna. “Now, it escaped the dream realm, and it is attacking my kingdom. I need your help.”
“Don’t worry,” said Leo. “We will help you protect your kingdom.”
"Thank you, turtles.” said Luna. “What are your names?”
“I’m Mikey, that’s Leo, Donnie, and Raph.” said Mikey. “Or Michelangelo, Leonardo, Donatello, and Raphael.”
“Okay,” Luna said. “To my kingdom!”
With a wave of her silver wand, a bright light flashed. The princess and the tmnt disappeared into her kingdom.
In Luna’s Kingdom:
The turtles gasped. They saw all the chaos the tantibus created.
“This used to be a beautiful and friendly kingdom,” said Luna. “but now it is destroyed. It’s all my fault.”
“Don’t blame yourself, Luna.” said Donnie. “You couldn’t control it.”
“What do we do first?” asked Raph.
“We must get into the castle.” replied Luna. “The tantibus is in there. But my guards have been brainwashed, and scattered all over the kingdom. I will fly up to look for anything big. Can you handle the guards?”
“Sure we can!” said Mikey. “Let’s go!”
The night princess flew up into the sky, while the turtles stayed on the ground.
Luna felt guilty as she saw the fear on the few people that were left. They were disappearing, but Luna didn’t know how.
The turtles ran into many of the guards. The first set was easy, but they got harder to beat as more guards came. They struggled to help the kingdom.
"How many of these guards are there?” asked Raph.
They fought through the piles of guards. They were attacked with swords and spears. They had to dodge attacks and fight back.
Luna saw the tantibus creating guards from the shadows. She swooped down to help the turtles fight them, using her horn to pick up objects to hit them with, and using her wings to stun and hit them. The turtles were shocked at what she could do. But the guards just keep coming.
“The tantibus just keeps creating more guards.” said Luna.
“What do we do?”asked Leo.
“This.” said Luna. She used her horn to make the turtles fly, and she flew up into the sky.
“Whoa! Awesome!” said Mikey.
But then, the tantibus created guards with wings.
Luna and the turtles fought them, but Luna eventually had to fly higher and faster. There were just too many of them.
She flew as fast as she could. They finally reached the castle. Luna was exhausted from flying, but she knew that they had to keep fighting. No matter what.
The turtles and Luna were badly hurt. But they gathered up all their strength. The tantibus was right in front of them.
It was in the shape of Nightmare moon in human form. Luna’s biggest fear. She was terrified.
They fought the tantibus, but it was like it didn’t feel pain. Nothing stopped it. It hit the spots where the turtles and Luna were most hurt at. Eventually, the tantibus struck the lunar princess. It went inside of her. Then, Luna transformed into Nightmare Moon. The tantibus took over Luna.
The turtles gasped in terror.
“NOW I HAVE ALL THE POWER!” yelled Nightmare Moon. She attacked the turtles.
The turtles didn’t want to hurt their new friend.
“Luna, snap out of it!” yelled Leo. Nightmare Moon attacked him.
“I am no longer Luna!” she said. “I am NIGHTMARE MOON!”
She was ten times more powerful than she was before. The turtles couldn’t defeat her. It’s like with each hit, she grew stronger. She badly injured the turtles.
Then, a bright light appeared in the sky. Everyone looked up. Nightmare Moon gasped.
It was her sister. The princess of the sun, Princess Celestia.
Princess Celestia gave the turtles 4 of the 6 gems.
The elements of harmony.
Then, she disappeared, saying, “It’s up to you.”
Suddenly, one element appeared on the turtles weapons.
On Mikey’s nunchucks was the element of laughter.
On Donatello’s bo staff, was the element of honesty.
On Raphael’s sai, was the element of kindness.
On Leonardo’s swords, was the element of generosity.
The turtles attacked Nightmare Moon all at once. A bright colors circled around them. Finally, Nightmare Moon was defeated. Luna was back to normal, laying on the floor. She looked up at the turtles, grateful and terrified.
Leonardo held out his hand to help her up. She took it.
“I’m so sorry, my friends.” she said. “I didn’t know what I was doing.”
“It’s okay, Luna.” said Mikey.
“We’re just glad you are okay.” said Raph.
Luna sighed. “Wait,” she said in panic. “Where is the tantibus?”
The tantibus was standing tall above them. It swallowed up the turtles and Luna. They were sent to a secret realm where the rest of Luna’s subjects were sent.
In the secret realm:
It was pitch black. It wasn’t dark, but everything was black. The turtles couldn’t find Luna. They started to panic.
“Where is Luna?” asked Mikey.
“She could be anywhere!” said Donnie.
“Then let’s start searching.” said Leo.
Luna was crying. She was full of grief and guilt. She felt like she made this happen.
The turtles heard her cries, which lead them to the lunar princess.
“Luna!” said Mikey.
“I can never forgive myself.” said Luna.
“Wait,” said Leo. “That’s it! Luna, the more you don’t forgive yourself, the more powerful the tantibus grows! Please, Luna, You have to forgive yourself! You had no control over yourself!”
Luna sighed. She thought about her sister, and her friends. She had to do it. For them. Then, her eyes turned white. The other two elements of harmony appeared, Loyalty and Magic. She and the turtles used the elements of harmony, and finally, the tantibus was defeated. Luna forgave herself.
Everyone was back in Luna's kingdom. With another spell, everything was back to normal.
“Thank you, so much.” said Luna. “The kingdom will forever be in your debt.”
Luna did a curtsy, and the turtles bowed.
“Hey,” said Raphael. “Who was that other girl we saw?”
“That is my sister,The princess of the sun. Her name is Princess Celestia.”
“Oh.” said Raph.
“So now what?” said Donatello.
“I am sending you home.” said Luna, while collecting the elements of harmony.
“Will we ever see you again?” asked Leonardo.
“I will visit you in your dreams, yes.” Luna said.
She waved her wand, and a gateway to New York appeared.
“Goodbye, Luna!” said the turtles.
“Goodbye! Thank you!” said the Princess of the night. She waved.
As the turtles walked through the gateway, they could’ve sworn they heard Luna say:
"Celestia, war is coming......."
Back in New York:
The turtles were sent back to the dock they left at.
“Wait,” said Leonardo. “Did time even pass?”
Everything looked exactly the same from when they left.
“We must’ve been at Luna’s kingdom for at least a whole day,” said Donnie. “so I guess not.”
Then, the turtles saw Princess Luna and Princess Celestia standing on the water. Luna had a big crescent moon under her feet, and Celestia had a bright yellow sun.
They disappeared, and in the sky, appeared a crescent moon and a bright yellow sun, side by side.