Disclamier: I don't own Avatar The Last Airbender and Avengers: Earth's Mightiest Heroes.
This is the story before the Season 6 of Winx Club.
Chapter 1 To Planet Elementia
At Crescent Island...
"ROARRR!"
Traag split lava out from it mouth to the Winx.
"Lava Jab!"Said Bloom and she's kick it to the Kraang Droids.
"Light Diamond!"Said Stella and she's throw it to Traag and explode it into pieces.
"YES!"Said Stella but then the broken body of Traag start to rebuild.
"Oh crud!"Said Stella
"Morphix Punch!"Said Aisha and she's throw it to three HYDRA Dreadnoughts.
"There are too many of the Kraang!"Said Tecna
"We need the Avengers and the Turtles!"Said Musa
"Agree! We have to retreat!"Said Flora
"Kraang Kraang need Kraang to send out the Scout Ships!"Said Kraang
The Scout Ships start to fly out from the Crescent Island and turn into Stealth Mode
and no anyone are see them and they split up and fly around the planet.
At Avengers Mansion...
"Not fair!"Said Donnie after he's play a chess lost to Spider-Man.
"But it's fair for me!"Said Spider-Man
"You are not the only one who is the genius guy at here Parker!"Said Donnie
"But you're more than a nerd. You're freak!"Said Spider-Man
"I am not a FREAK!"Shouted Donnie
"Donnatello you must-"Said Splinter and then the portal is open and the Winx are walk out from the portal.
"Winx Club!"Said Wasp
"What's going on Winx?!"Asked Iron Man
"The Kraang had secret invasion for Planet Elementia in the Magic Dimension."Said Bloom
"We need your help!"Said Stella
"The Kraang in the Magic Dimension?!"Asked Mikey
"And not at all..."Said Tecna and she's show the hologram of HYDRA soldiers that work with the Kraang.
"HYDRA!"said Captain America
"Oh great! The Kraang are team up with HYDRA! Can this get more worst?"Asked Raph
"Hope it's not."Said Musa
"But we have to do this as secret. So don't make people of the Elementia in fear."Said Flora
"Or even the protector od them, the Avatar."Said Bloom
"Like the seven Avatars of Vishnu?"Asked Hawkeye
"Umm... no."Said Stella
"Doesn't matter. We had to protect them."Said Bloom
"If the HYDRA are behind this. Count me in!"Said Captain America
"Wait! And who gonna watch the city while we gone?"Asked Iron Man
Few hours later...
"Hope that you guys can do this."Said Iron Man
"We are glad to help you."Said Falcon
"Take care of yourselves."Said Iceman
"We can watch the city."Said Doc Samson
"Bye-Bye!"Said Shadowcat
"So long!"Said Nightcrawler
"Elementia here we go!"Said Leonardo and Wasp