This movie is a dream Velma had.
It would explain the inconsistencies with her family as well as her behavior. The curse is an allegory for being admitted into a mental institution
- Scooby and Shaggy represent binge eating disorder
- Daphne represents anorexia
- Velma represents Schizophrenia
- Fred represents Depression and grief
- All of the other characters represent staff at the Psychiatric Hospital.
This is the chronologically last adventure in Scooby-Doo and they do die in the explosion
- The end of the film is their dying dream.
