There isn't even a mystery, thus explaining the lack of the Mystery Machine (an ugly red van is the replacement). So why on earth they bothered to make this a Scooby Doo movie is puzzling if they weren't deliberately exploiting a popular character.
It's just all wrong! Shaggy gets a job in an all-girl (actually Ghoul) school teaching Phys. Ed. I'm sorry but when did Shaggy become a qualified Gym Teacher? There's some pointless story involving a volleyball competition with a Military School next door that isn't good enough to distract from the bore and then after that some old hag called Revolta turns up and turns them all into zombies. Uh...yeah.
Shaggy obviously saves the day but by this point I had dozed off. It bored me to sleep!
The 1.33:1 full frame picture shows how cruddy the animation is and the sound is plain old mono. Aside from the usual 'how to draw' extras this DVD also features a trailer that cheekily uses lots of footage of modern Scooby animation and mixes it with Ghoul School to make it look new. I wasn't fooled.
Don't buy this. Rent it for the kids if there is really nothing else.