After a tragic abort, Lola and her husband Adolfo adopt Tin and Tina, two lovely albino brother and sister with an ultra-catholic education that makes them interpret Holy Bible verbatim.

Ravaged by the loss of Scooby-Doo in a snowmobiling accident, the Mystery Inc. gang must reunite one final time to plan the funeral and solve one last mystery.

It’s four years later, and a new group of students has been placed in Saturday detention at the infamous and prestigious Crestview Academy. When Siouxsie, sophomore ‘undercrust,’ crashes the party…