A different plot idea could be centered around the villains who were sent back to their own universes. What if some of them managed to find a way back to Peter's universe? And this time, they form an alliance, using their combined knowledge of different universes to try and finally defeat Spider - Man once and for all.
One idea could be that Spiderman 2099 has to team up with a group of rebels from a future dystopia to take down a powerful corporation that controls the city. They might face advanced technology and dangerous enforcers.
Another idea is a time - travel fanfiction. Spider - Man could be sent back in time to when his Uncle Ben was still alive. He would have the chance to prevent his uncle's death, but he'd also have to deal with the consequences of changing the timeline, like how it might affect his own development as a hero.
A story could be set in a future where the worlds of Marvel and DC have merged. Spiderman and Starfire are part of a new superhero team. They have to deal with the cultural differences between their two groups of heroes as well as face off against new villains created by the merger of the two universes.
One idea could be exploring what would happen if Spider - Man had to team up with a villain to stop a greater threat. For example, partnering with Doctor Octopus to take on an alien invasion.
One idea could be that Spider - Man has to face a new villain who has the power to manipulate his darkest fears and turn them into reality. Another could be a version where Spider - Man is wrongly accused of a major crime and has to clear his name while also dealing with the city turning against him.
A cool plot could be that there is a glitch in the game world that starts causing real - world disasters. Spiderman has to figure out how to fix the glitch by going deeper into the game code, all while still dealing with his regular villains.
One idea could be that the dog meets other animals along the way that help it in unexpected ways. For example, a wise old owl could guide it through a forest at night.
Another plot idea could be a deeper exploration of Peter Parker's relationships with the different versions of himself. How they learn from each other and grow together in this strange new situation. For example, they could exchange their experiences of being Spider - Man in different ways and environments, which would be really cool.
One idea could be that Star Lord accidentally lands on Earth in New York and runs into Spiderman. They team up to stop a group of intergalactic smugglers who are using Earth as a hiding place for their illegal goods. Spiderman uses his knowledge of the city and his web - slinging skills, while Star Lord brings his blasters and space - faring expertise.
A cool plot could be that a common enemy emerges, one that is immune to Spiderman's usual web - slinging and acrobatic combat, and also resistant to the Phoenix's raw power alone. So, Spiderman and the Phoenix - influenced character (it could be Jean Grey or someone else with Phoenix powers) have to combine their skills and minds to defeat this foe. They start off not getting along well, but as they face challenges, they learn to work together.