Disclaimer: I do not own any of these characters. Except for Percy K. UnJackson, but he's based off of Percy Jackson...
Percy K. UnJackson
Prologue
In Tartarus…
"I get defeated over and over again!" Kronos muttered in frustration right after another failed escape from the evil land of Tartarus. "How am I going to escape from Tartarus and overthrow Olympus?"
"You can't with all the brothers working together…" whispered a voice out of nowhere.
"How will I defeat Olympus?" Kronos asked.
"Make one son join you, one son defeated, and attack the last…" answered the voice.
"Who are you?" Kronos questioned, but the voice faded away by now.
Kronos thought and thought and went over the mysterious voice's words. One join you, one defeated, and attack the last… What the heck was that supposed to mean? He tried putting the Big Three in different places but nothing would work out. Suddenly Kronos thought of an idea. He summoned Hades, king of the Underworld, to a meeting.
"I want to make a pact with you, son," Kronos stated. "Would you like to have the power of time and sky?"
"All I really wanted was the power of the sea, but the power of the sky is fine," Hades replied. "Oh and don't call me that," he blushed. And Kronos was like -0-!
"So first choice: the ocean. Second choice: sky," Hades agreed.
Kronos commanded, "I will grant you one of these powers as long as you help me seize your brother!"
Hades looked baffled and then thought about it.
"Yes," Hades agreed.
In Olympus…
Zeus, the god of the sky, was sitting on his throne, resting from the battle with the Titans as Hermes, the messenger, flew in with a message.
"Message from Hades. To Zeus and Poseidon," he stated, "'I would like you to come to the Underworld for a while to consult the matter of the repeating annoyance of the Titans.'"
"Did you tell this to Poseidon?" Zeus asked.
"Yes," Hermes answered and flew off.
One day later, Zeus and Poseidon arrived in Hades palace in a chariot with the two royal Pegasi.
"Where is Hades? We are his brothers and want to consult some private matters with him," Zeus asked a guard skeleton.
"First right, second left, and fifth left at the bottom of the staircase!" the skeleton barked harshly.
Zeus and Poseidon hurried over to the room.
"Are you sure that this is the right one?" Poseidon asked. "Our powers don't work down here."
"Yes. I am sure," Zeus answered.
"I think I should wait outside because… you know…" Poseidon reminded.
"That Hades screams at you and tells you to get out because he's jealous? Sure!" Zeus teased.
"Shhh! People might hear," Poseidon shushed as Zeus walked inside.
Zeus expected to find his brother sitting in his "royal" throne, but he found something extremely worse.
His father.
"MWAHAHAHA!" Kronos cackled. "FYI, You have just been captured! And now nothing will stop me from gaining control of the whole universe!"
"NEVER!" Poseidon burst through the door to the dungeon.
"You do know that your powers won't work down here," Kronos reminded.
"Yes. Which is why I came to fight you instead of my brother," Poseidon stated.
"I'll never let you die!" Zeus cried.
"Yes. Please! You are my younger brother, and it is my duty as an older brother to protect you in every way," Poseidon countered. "That is why I shall fight you, Kronos, to the end!"
They fought and fought, but at the end, Kronos was standing over his son.
"Surrender now, son," Kronos offered, "and join me as I proceed to take over the universe!"
"Sure!" Poseidon agreed.
Kronos helped him up.
"Over my dead body!" Poseidon finished and dashed out of the room.
"OHHHHH!" Zeus screamed.
"GET BACK HERE, YOU RASCAL!" Kronos boomed.
"RUN!" Poseidon called to Zeus.
Two by two the brothers dashed up the stairs.
"At the last steps, our powers will work," Zeus informed.
They reached the last steps and Poseidon flooded the stairs. It slowed down their father down tremendously. Zeus and Poseidon burst through the main doors. Sure enough, there was an army of the dead stumbling towards them.
"Hades betrayed us…" Poseidon gasped.
Zeus summoned a jet stream that pushed all the skeletons away in the path of their chariot. They climbed into the chariot and flew away
"We escaped!" Zeus cheered.
They cheered until the heads of the Pegasi turned around.
"Hades… Hades…" Poseidon voice cracked.
"Killed our Pegasi and made them his servants!" Zeus boomed.
The dead Pegasi attacked the Olympians and let the chariot drop. Zeus sent lightning at them and they dodged perfectly. He sent a storm at the Pegasi and they flew through it gracefully.
"It's hopeless," Poseidon moaned. "They are the best Pegasi in all of Olympus."
Zeus summoned a sandstorm that momentarily blinded the Pegasi. He flew off the chariot with Poseidon grasping his hand. Just then Hades appeared and grabbed Poseidon's leg, preventing him from flying away.
"You won't escape this time, brothers," Hades sneered as the brothers slowly descended because of the weight.
"Never forget me, brother," Poseidon called.
"NO!" Zeus yelled as Poseidon let go.
"I shall rise again, Hades!" Poseidon threatened on the way down.
Poseidon and Hades crashed to the ground and were stunned for about 10 minutes. In that 10 minutes, Kronos finally arrived and crushed Poseidon and fed his remains to Rhea. The Olympians were never the same again…