Zack isn't thrilled about having to get a tooth pulled, but a trip to the orthodontist proves a lot hairier than he ever expected. Nice old Dr. Silver has been replaced by the fang-toothed Dr. Jekyll, a mouthwash-guzzling mad scientist whose secret experiments have gone ker-plewy.

What would happen if the fortunes in fortune cookies started coming true? Confucius says something very weird is going on! Could his thirteenth adventure be Zack's unlikely number?