Hotel Transylvania 4 takes place on the 125th anniversary of the hotel, where Count Dracula announces his plans to retire and leave the hotel to his daughter, Mavis, and her husband, Johnny. However, things take a turn when Johnny discovers that Dracula plans to leave the hotel to him, and he becomes excited, but Dracula later reveals that there's a "Monstrous Real Estate Law" that prevents him from leaving the hotel to a human.
Johnny meets with Van Helsing, who helps him become a monster using a device called the "Ray Monstri Picador." However, the device malfunctions, and Johnny turns into a giant green dragon. Dracula and Johnny set out on a journey to find a special crystal to reverse the effects, but their trip is filled with obstacles and adventures.
Meanwhile, back at the hotel, the other monsters are transformed into humans after drinking irradiated water from the Picador device. Erika, Mavis, and the others try to find a way to reverse the effects, and they eventually discover the location of the crystal cave in South America.
As Dracula and Johnny near the crystal cave, they face various challenges, and Johnny becomes increasingly angry and mutated. Eventually, they reach the cave, and with the help of the others, they manage to reverse the effects, and Johnny returns to his human form.
In the end, the Hotel Transylvania is rebuilt, and Dracula sees that his daughter, son-in-law, and grandson are happy together, which gives him a sense of closure. The movie ends with a heartwarming moment of the family hugging each other, symbolizing their newfound appreciation for each other.
Here are the key facts extracted from the text:
1. The movie begins with the 125th anniversary celebration of Hotel Transylvania.
2. Dracula remembers the happy times he had with his daughter during this celebration.
3. Dracula's son-in-law, Johnny, ruins the celebration by throwing a big party.
4. Dracula freezes all the guests to fix the situation, except for his grandson, who is also a vampire.
5. Dracula's daughter, Mavis, tries to understand Johnny and loves him for who he is.
6. Dracula continues the celebration and announces that he will make an important announcement at midnight.
7. Dracula goes outside to get some fresh air and meets Eric, who advises him not to stress about the party.
8. Dracula decides to retire and leave the hotel to his daughter, but Johnny overhears this and gets excited.
9. Johnny tells Lion, and they both get excited, but Dracula doubts that he will leave the hotel to Johnny.
10. Dracula practices how to give the news about his retirement and the future of the hotel.
11. Johnny interrupts Dracula and thanks him for considering him in the hotel's legacy.
12. Dracula becomes distressed upon hearing Johnny's plans to modify the hotel.
13. Johnny invents a law called the "Monstrous Real Estate Law" to prevent Dracula from leaving the hotel to a normal human being.
14. Dracula stands in front of all his guests to make the big announcement but becomes nervous and improvises.
15. Dracula tells everyone that the big news is that he will build a new bathroom in the hotel.
16. The guests are disconcerted by the news, and Dracula continues with the party as if nothing had happened.
17. Johnny is lamenting for not being a monster, and Van Helsing offers his help.
18. Van Helsing and Johnny go to the laboratory, where they find a device that can turn anyone into a monster.
19. Van Helsing tries the device on his guinea pig, Chiki, and then uses it on Johnny, turning him into a giant green dragon.
20. Dracula, who was hiding, hears the noise and encounters the giant dragon.
21. Dracula tries to turn Johnny back into a human using the device but fails.
22. One of the shots falls into a water source, and another shot bounces and falls against Dracula, turning him into a mortal without powers.
23. Johnny tries to save Dracula, and they both end up in the water, creating a big mess.
24. Dracula's friends discover that they are no longer monsters and have become mortal.
25. Frankenstein becomes a papucho with beautiful hair and an impeccable smile.
26. Erika and the others try to hide but are discovered by the humans.
27. Erika asks Van Helsing what he did, and he explains that the transformed ones will continue to mutate.
28. Jiji transforms into a monster and starts destroying everything.
29. Dracula and Johnny make their journey through the jungle, facing various obstacles and adventures.
30. They meet a giant spider and have to navigate through the jungle to find the crystal cave.
31. Dracula gets upset with Johnny for taking him up a mountain and for being clumsy.
32. Johnny and Dracula fall and have to be saved by a giant bird.
33. Johnny learns to fly, and they both have a bonfire and talk calmly.
34. Dracula is angry because his marshmallow burned, but Johnny helps him see the positive side.
35. Dracula is about to confess the truth to Johnny about the "Monstrous Real Estate Law" but is interrupted.
36. Johnny gets upset and starts to mutate, and Dracula tries to cover up his lie.
37. The group finds the crystal cave, and Dracula hits a wall, accidentally hitting the glass hinge of the Mostri Chopper Ray.
38. Everyone helps to cover the device, and it shoots Johnny, turning him back into a human.
39. However, Johnny's transformation was too advanced, and it was too late.
40. Dracula arms himself with courage and rushes towards Johnny to try to stop him.
41. Johnny is furious and about to burn Dracula, but Dracula tells him that he is like his marshmallow - flawed but still good.
42. Johnny hugs Dracula, and the Smos Ray works, turning Johnny back into a human.
43. The group returns to Hotel Transylvania, and Dracula offers the hotel to his daughter and son-in-law.
44. However, the hotel was destroyed while they were in South America.
45. Dracula is sad, but he decides to give the hotel to his daughter, son-in-law, and grandson to rebuild it as they want.
46. A year passes, and Dracula sees that the Hotel Transylvania has been rebuilt with many changes, making it a magical and more entertaining place.