It's time for the science fair in GravesVille and thirteen year old, Ryan Ghouls is beyond excited. That is until his annoying cousin, Bryan visits, but Ryan and his friends refuse to let Bryan ruin their fun. But when the chemicals from an experiments belonging to Ryan's close friend, Mariska spills onto his cherry gelatin snack he soon realizes that it has come to life.
Now, keeping the new blob monster a secret, Ryan and his best friend, Kyle Wolfermen can't seem to figure out why the little blob monster won't stop growing. But things begin to go awry when Ryan and Kyle discover that the medicine they've given to the blob monster has gone terribly wrong. Ryan and his friends must now save the town before it's too late. Can Ryan and his friends stop the blob monster from devouring the town or will it be too late?