In a fanfiction scenario, it could be that the Time Stone has some sort of connection to the magic in the Harry Potter world. Doctor Strange is in trouble while dealing with an enemy who wants to misuse the Time Stone. Harry Potter, with his knowledge of time - turning devices like the Time - Turner, manages to outwit the enemy and save Doctor Strange.
In a fanfiction where Harry Potter meets Doctor Strange, the possibilities are endless. Harry, who is used to the structured magic of the wizarding world, would be fascinated by Strange's more fluid and unpredictable magic. Strange, on the other hand, would be intrigued by the hidden magical society that Harry comes from. They could exchange knowledge about different dimensions. Harry could learn about the multiverse from Strange, and Strange could gain insights into the magical dimensions that exist within the Harry Potter universe. They might also have a friendly duel to test each other's skills, which would be a spectacular display of two very different kinds of magic.
Well, in this fanfiction scenario, Harry Potter might use his magic skills. Maybe he travels through time and space using a spell like the Time - Turner or some other powerful magic. He could then arrive in the Star Wars universe where Shmi is in danger. He'd use his spells to fend off the attackers, like using a Stunning Spell on the Tusken Raiders who might be threatening Shmi.
Well, it could happen in a world where magic and the chaos of Gotham collide. Maybe Harry uses his magic to get into the Joker's mind and find the good that's left in him. He could use a spell like Legilimency to understand the Joker's past traumas and then use healing magic to start the process of redemption.
Well, perhaps there is a dark force that is after Maximoff and it's affecting different universes. Harry Potter, being the hero he is, senses this disturbance in the magical fabric. He travels to Maximoff's realm using his Patronus as a guide. Once there, he uses his knowledge of defensive magic, like the Shield Charm and Stunning Spells, to protect Maximoff and save him from the impending doom.
A possible plot could involve a new, powerful dark sorcerer who has found a way to combine magic from both universes to become invincible. Doctor Strange tries to stop him but is quickly overpowered. Meanwhile, Harry Potter senses the danger through his connection to magic. He travels to Doctor Strange's side. Harry uses his knowledge of magical creatures from the Forbidden Forest. He summons a group of Centaurs who help him in the battle. With their combined strength and Harry's strategic use of spells like the Stunning Spell, they are able to defeat the dark sorcerer and save Doctor Strange.
One way this could happen is if Harry Potter discovers a new form of magic that can reverse the dark magic influencing the Death Eaters. Maybe he finds a powerful spell during his exploration of ancient magic that can purify their souls and free them from Voldemort's control.
It could be that after the war, Harry feels a need for a new purpose. He might start learning about Muggle healing methods out of curiosity. His quick - learning skills, which he developed during his years at Hogwarts, would help him quickly understand medical concepts. He could also use magic to heal some ailments that normal medicine can't, thus becoming a very unique doctor.
Well, Hermione could be really intrigued by Doctor Strange's library. She might ask him all sorts of questions about the books and scrolls he has, and they could exchange knowledge about different magical concepts. For example, Hermione could learn about the use of astral projection from Strange, and in return, she could teach him some of the more complex spells from the wizarding world.
Maybe Harry has some strange magical illness that normal wizards can't cure. So he has to seek help from a very special doctor who might have some unique remedies.
Well, they could have all sorts of adventures. Maybe they'd visit different magical and alien worlds. The Doctor could show Harry some truly out - of - this - world places that even the wizarding world hasn't seen. And Harry could introduce the Doctor to the magic of Hogwarts, like the secret passages and the magic spells.