One possible plot twist could be that the Avengers mistake Spider - Man for an enemy at first. Maybe they see him using his powers in a way that seems suspicious. Then, as they start to fight, they realize he's just a young hero trying to do good. Another twist could be that Spider - Man has a secret connection to one of the Avengers, like he's related to Tony Stark in a way no one knew. This would add a whole new layer to their interactions.
Well, a really cool plot twist could be that the Avengers get their powers swapped with Spider - Man's. So, Captain America has Spider - Sense, and Spider - Man has super - soldier strength for a while. It would be chaos as they all have to figure out how to use these new powers. Also, imagine if the villains in Spider - Man's world start targeting the Avengers because they think they can use the heroes to get to Spider - Man.
The plot might involve Spider - Man getting into some trouble in New York and the three Avengers coming to his aid. It could be that a powerful alien artifact has been stolen and Spider - Man accidentally gets blamed for it. The Avengers then step in to help clear his name and find the real culprit while also protecting the city from the potential danger of the artifact.
One interesting plot twist could be that Ultron hacks into Spider - Man's suit. This would put Spider - Man at a huge disadvantage as Ultron could control his movements or disable some of the suit's functions.
One interesting plot twist could be that Venom starts to have memories of Peter Parker's life as Spider - Man. This would create a strange dynamic where Venom understands Spider - Man's motives on a deeper level and might even start to protect the things Spider - Man cares about. For example, Venom could find itself saving Mary Jane from a random mugger because it has a new - found sense of connection to Spider - Man's world.
A great plot twist could be that Peter ends up saving one of the Avengers in his Spider - Man identity, but the Avenger doesn't recognize him at all. Later, when Peter is in his normal self, he casually mentions some details about the incident that only the person who was saved would know. This makes the Avenger start to suspect that there's more to Peter than meets the eye.
Well, the whole Venom symbiote thing is a huge plot twist. When the alien symbiote attaches to Peter, at first it seems like a cool upgrade. But then it starts to affect his mind and personality. Eventually, Eddie Brock gets the symbiote and becomes Venom, one of Spider - Man's most iconic foes. It completely changes the dynamic in the comic world.
In a fanfiction scenario where the Avengers kidnap Spider - Man, it could be because of a prophecy. The Avengers might believe that Spider - Man will cause great harm in the future according to some ancient prophecy. So, they take him against his will to a secret location. However, Spider - Man manages to convince some of the younger Avengers, like Peter Parker's friends among them, that he's not a threat.
Well, it could start with Spider - Man being framed for a crime he didn't commit. The Avengers believe in his innocence. They fight for him against a corrupt government agency that wants to arrest him. Along the way, they discover that there's a bigger conspiracy at play. Black Widow uses her espionage skills to gather intel, Hulk provides the brute force when they face the agency's armed forces, and the other Avengers contribute in their own ways to clear Spider - Man's name and protect him from harm.
Well, one possibility could be that Spider - Man is mind - controlled and ends up attacking the Avengers. Maybe a villain uses some sort of advanced technology or magic to make him do it. He might be forced to use his web - slinging and super - strength against his allies, causing harm both physically and emotionally to the Avengers and their fans who look up to their unity.
One possibility could be that the Avengers capture Spider - Man because they suspect he has been influenced by some sort of mind - control or dark magic. Maybe they think he's a threat to the city without realizing he's actually trying to help. Another could be that there's a misunderstanding in which Spider - Man's actions are misinterpreted as being against the Avengers' interests.
Well, one possible plot could be that there's a misunderstanding. Maybe some bad guy has framed the Avengers for something really bad, and Spider - Man, believing the false evidence, decides to take them on. He uses his agility and web - slinging skills to surprise the Avengers at first. But as the fight progresses, he starts to realize that something is off and that they might be innocent.