It was an average day in the Everfree Forest, except that the Old Castle was currently occupied by several restorers. These restorers were the Man Six, who had decided that with nothing else in urgent need of doing, they might as well be archeologists for a while.
Spike, who was there to catalog any interesting find, was currently reading the newest Power Ponies issue, though he'd have preferred to take a look at some Earth comics. Unfortunately for him, Aristotle had trouble getting more than issue or two at a time into this world, and Karkat was no help in the matter, so Spike had been spending his time reading old Marvel comics, since Aristotle preferred that particular publisher and wanted to read them too. Naturally, Spike had picked up his reading material from the House of Enchanted Comics, so we all know where this is going.

VORTEX SOUND!
Upon coming to, Aristotle noticed that he felt heavier and a buzz at the base of his neck. He also noticed Spike was dressed like Captain America and every member of the group was together on a rooftop.
"Hey, Spike, Karbro, Assorted Friends, how you all doing? Oh, uh, Spike? You're dressed like Captain America. Just thought you'd like to know," Aristotle put out there.
"You like a cross between Spider-Man and Iron Man," Spike noted. "And Karkat looks like Doctor Strange. Hey, Sweetie Belle looks like the Black Widow. Don't recognize Scootaloo or Apple Bloom, though."
Aristotle broke in. "Apple Bloom seems to be wearing the She-Hulk's costume. Scootaloo, if I have it right, should be Ms. Marvel. Or Binary. Or Warbird. Or Captain Marvel. Carol Danvers. Too many names, that one."
The Man Six, being used to these kinds of shenanigans, quickly came to a conclusion on what was going on and who they were. Aristotle, it turned out, was Iron Spider.
Once it was determined what was what, Spike recalled," WemayhavetofightaMedusaslashJokerripofftogetoutofthisplace."
"What."
"IgotmybookfromtheHouseofEnchantedComicsbutIthoughtitwasjusthyperbole."
"Who were the heroes supposed to be?"
" Kind of a Justice League ripoff with the Hulk and a Cyclops slash Crystal mashup."
"Well, let's show this would-be world-beater what some real heroes can do. Say the battle cry, Cap."
"Okay...

AVENGERS ASSEMBLE!"

Author's Note

To be continued next time! So yeah, I like comic books, and I'm a Marvel fan. I wanted to mix thing up a little since the Man Six and Mane Six correspond to different heroes. Aristotle gets Spider-Man with the Iron Spider armor for being jokey with serious feelings of guilt for Karkat's actions below the surface and a tech head. Karkat is Doctor Strange for his Mastery of the Mystic Arts and driving need to atone. Spike is Captain America for being unpowered but still somehow cool. Scootaloo is... Carol Dancers for her love of flying and deeper psychological issues (Danvers had a Demon in a Bottle arc. Iron Man helped her deal with her drinking problem.). Apple Bloom is the She-Hulk for her lack of confidence and (presumed) Earth Pony Strength. Sweetie Belle takes up the role of the Black Widow because it's silly. All of the characters I've picked have been Avengers at some point, though Doctor Strange was only a member of the Secret Avengers, so that one's a little iffy. Until next time, keep saying,"Make mine Unintended Consequences!"