My thought process

John Deacon and his new fiancé, Veronica, decide to go and meet their former science professor, Dr. Everett Scott, but get, shall we say sidetracked on the way. Stranded at a dead end on a rainy night, they find a castle with a light and meet many interesting people, such as Dr. Freddie n Furter, his maid Maygenta, and his creation, Roggie.
NOTE: I'm changing some of the stuff from the movie for the sake of my sanity