A possible plot could be that a new threat emerges that can nullify the powers of the Justice League. Spider - Man, being from a different universe, has a power set that is not affected. So, the League reaches out to him for help. Together, they embark on a journey to find the source of this power - nullifying threat. Along the way, Spider - Man teaches the League members some of his street - level fighting tactics.
Maybe the plot could involve a device created by Lex Luthor that accidentally merges the two universes. Spider - Man then teams up with the Justice League to find a way to separate the universes again. During this time, he has to deal with the different personalities and powers of the League members. He might form a special bond with Batman, as they both rely on their wits and gadgets.
Well, it could be amazing. Picture Spider - Man's acrobatic fighting style combined with the superpowers of the Justice League members. Maybe he teams up with Superman to save a city from a huge threat. Their different personalities would create interesting interactions, like Spider - Man's quippy nature against Superman's more serious and noble demeanor.
It could be really exciting. Imagine Spider - Man swinging into the Justice League's world. He might team up with Superman to take on a powerful new villain. Maybe they would have some initial misunderstandings due to their different ways of operating, but then quickly realize they can complement each other's skills.
There could be a storyline where an evil force has brainwashed some of the Justice League members, and Spider - Man has to figure out a way to break the spell. Along the way, he teams up with the unaffected members like Wonder Woman. This would show his intelligence and resourcefulness. Also, a story where Spider - Man accidentally ends up in the Justice League's universe and they have to work together to get him back home while also dealing with threats in their world.
One possible plot could be that Spider - Man is accidentally transported to the DC universe where he meets the Justice League. They initially view him with suspicion but soon realize his skills and good heart. Together, they face a common enemy like a powerful interdimensional villain who is trying to merge the Marvel and DC universes in a chaotic way.
One idea could be that Voldemort discovers a way to enter the DC universe and teams up with some of the Justice League's villains like Lex Luthor. The Hogwarts students and the remaining members of the Justice League have to join forces to stop them. The wizards can use their magic while the superheroes use their powers.
Spider - Man and Batman would also have a fascinating interaction. Both are known for their intelligence and use of gadgets. They could compare notes on their detective skills and strategize together against their enemies. Maybe Batman would be impressed by Spider - Man's agility and quick thinking in combat.
A cool plot could be that the Justice League discovers a strange energy signature that turns out to be Iron Man's arc reactor. They track it down and find Iron Man. Iron Man is initially out of his depth in this new world of superpowers. But he uses his wits and technology. For example, he could upgrade the Flash's suit to make him even faster, and in return, the Flash helps him understand the new world he's in. Together, they all face off against Darkseid who has plans to invade both universes.
Maybe there's a multiverse - related plot where the universes of Spider - Man and Young Justice start to merge. This causes chaos as characters from both worlds start to appear in the wrong places. The Young Justice team and Spider - Man have to work together to find a way to separate the universes again. They'd face challenges like dealing with different power levels and the cultural differences between their two groups.
A plot could involve Goku being summoned to the DC Universe by a powerful magic user who believes Goku can help stop an impending apocalypse. The Justice League is skeptical of this strange, powerful being from another world. However, as they face challenges together, they start to trust Goku. For example, when they are up against a horde of powerful demons, Goku's speed and strength are crucial. He could teach some of the League members about ki control, and in turn, they could teach him about teamwork in a more strategic sense compared to his usual battles on Earth.
One idea could be that Alex Mercer from Prototype finds himself in the Justice League's universe. He could initially be seen as a threat by the League. But then, they realize his power could be used to fight a common enemy, like Darkseid. Mercer's shape - shifting and regenerative abilities would add an interesting dynamic to the team's combat strategies.