The Hogwarts Express could somehow be connected to the DeLorean. Maybe a powerful magic made the two vehicles fuse together. Harry, Ron, and Hermione could find themselves in the DeLorean instead of the Hogwarts Express on their way to school. They would then be thrust into the Back to the Future world. In this new world, they would have to use their magic skills to get back to their own universe while also helping Doc Brown and Marty with their problems, such as fixing the time - space continuum in the Back to the Future world.
Perhaps a spell gone wrong in the Harry Potter universe could open a portal to the Back to the Future universe. Hermione, being the brilliant witch she is, could team up with Marty McFly. They would have to learn about each other's worlds quickly. Hermione could teach Marty about magic, and Marty could show Hermione how to use the flux capacitor. Together, they could face challenges in both universes, like stopping Biff from taking over Hill Valley in the Back to the Future world and defeating Death Eaters in the Harry Potter world.
Chapter 753, "Final Judgment", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with In the decade she had been with Fang Wenzhe, Shu Yan never thought...
Chapter 773, "I am the Trainee Here", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event.
Chapter 477, "Brother Pig, Don't Be Afraid", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event.
Chapter 683, "This is where you will be filming from now on!", is the clearest early answer because it turns Alright's situation into a concrete plot event. Early on, The Capital had entered winter by November.. By the end, Before going to Dragon Ridge Island, Jiang Li did seem to have taken....
Chapter 498, "How can someone be so ugly?!", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with .....If you don't love me, give my heart back, you traded love for my...
Chapter 408, "You Can't Be on the Same Team!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Zheng Xun fell silent after he understood the situation.
Chapter 716, "Cook a Special Meal", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with The following week was much quieter, and Jiang Li finally had some... and closes on Shao Changqing had also mentioned this issue before, saying that....
Chapter 560, "These People Have Definitely Been Cursed!", is the clearest early answer because it turns Guo Xing's situation into a concrete plot event. Early on, But the other party had already walked far away, and it didn't seem....
Chapter 610, "Building a House?!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Therefore, Jiang Yan became even more entitled and bossily ordered...
Chapter 769, "Su Yinwan Gets into Trouble!", is the clearest early answer because it turns Miss Su's situation into a concrete plot event. The chapter gives readers a real answer by opening on The Jiang Family's banquet caused quite a buzz online.