Maybe there's a villain who has the ability to create illusions. He uses this power to make the public think that Spiderman has gone rogue and is working with evil organizations. The Totally Spies are called in to investigate. As they dig deeper, they discover the truth and help Spiderman clear his name. Then they join forces to defeat the illusion - creating villain.
One idea could be that the Totally Spies girls are on a mission in New York and accidentally cross paths with Spiderman. They initially mistake him for a villain but soon realize he's on their side. They then team up to take down a common enemy who is using both high - tech gadgets and super - powered minions.
A crossover with Sailor Moon might also be cool. The Totally Spies could find themselves in the Sailor Moon universe and have to help the Sailor Scouts fight against a new enemy that is after some powerful artifact in both their worlds. The spies' espionage skills would be useful in gathering information about the enemy's plans, while the Sailor Scouts' magical powers could be used in direct combat.
A possible plot could be that there is a threat to the world that involves both superpowers and high - tech espionage. The Totally Spies are called in to investigate the technological aspect, while Spiderman is already on the scene dealing with the super - powered part of the threat. They cross paths and at first are not sure if they can trust each other. But as the situation worsens, they realize they need to work together. They combine their unique skills, like Spiderman's web - slinging and the Totally Spies' ability to blend in and use advanced gadgets. In the end, they defeat the common enemy.
Another plot could involve an OC who is a computer genius. He creates a new type of spy gadget but it gets stolen by an enemy spy organization. The Totally Spies and the OC then have to work together to retrieve the gadget and stop the bad guys from using it for evil purposes.
It could be Doctor Octopus. He might team up with some evil spy organization. His mechanical arms and scientific knowledge combined with the sneaky tactics of the spies would make for a formidable foe for Spiderman and the Totally Spies.
Well, you could start with an OC who is an inventor. The OC invents some really cool gadgets that catch the attention of the Totally Spies. They start to work together on missions, and during this time, a harem dynamic could develop. Maybe the OC has a kind heart and is always there to support the spies, which makes them all develop feelings for the OC. Also, the OC could have a secret identity that is slowly revealed throughout the fanfic, adding more drama to the relationships.
One idea could be a story where Spiderman has to team up with his greatest enemies to fight a new, more powerful threat from outer space. This would force him to put aside his differences and find common ground with the likes of Doctor Octopus and Green Goblin.
Another idea is that the Totally Spies girls are sent on a mission to the Hidden Leaf Village. They end up getting involved in the Chunin Exams. They use their high - tech gadgets to help some of the younger ninjas, like Konohamaru, in the exams while also learning about the ways of the ninja. This could lead to some really fun and action - packed scenes.
Another idea is a time - travel lemon fanfic. The spies travel back in time to a different era, like the 1960s. There, they face new challenges and also develop different relationships. Maybe one of the spies falls in love with a character from that time period and there are some steamy moments as they navigate the differences in culture and technology.
Perhaps in a fanfic, Todd has a secret that only Red discovers. This secret could be related to his past or some special power he has. Red helps him deal with it, and through this process, they grow closer. Their relationship could be a slow - burn one, starting from friendship and gradually evolving into something more romantic as they go through various adventures and solve spy - related problems.
One plot idea could be that the Black Knight has a change of heart and teams up with Clover to take on a new, more powerful enemy. They could use their combined skills, Clover's charm and agility, and the Black Knight's strength and combat expertise.