When Zack goes to Florida to visit Mel & Shirley's Wonderful World of Dolphins, he is surprised to discover that he can understand and speak to dolphins, which enables him to solve a kidnapping. When Zack is given the chance to swim with dolphins on a trip to Florida, he dives right in. But before long, Zack is surprised to find that the dolphins are trying to tell him something ? and even more surprised that he can understand and talk to them! There's...

While Zack is being treated by Dr. Jekyll, his new orthodontist, the doctor undergoes a strange transformation into a growling monster.

After Zack opens his medicine cabinet one morning and sees a boy who could be his double staring back at him, he enters a parallel universe.

Ten-year-old Zack gets gets a chance to meet the old horror flim star Count Bugosi, who may or may not be a real vampire.

When Zack uses a magic box from Tibet to produce a duplicate of himself, he finds that he has created more problems than he has solved.

Ten-year-old orphan twins Wally and Cheyenne Shluffmuffin have had it bad at Cincinnati's Jolly Days Orphanage, but things get much worse when the Mandible sisters offer to share their home in the Dripping Fang Forest.

The ten-year-old Shluffmuffins twins, still evading the evil, giant ants that tried to adopt them, discover the culinary delights of swamps and encounter a zombie who bears a strange resemblance to their deceased father.

While trying to convince the FBI that giant ants are kidnapping and enslaving the citizens of Cincinnati, twins Wally and Cheyenne Shluffmuffin, with the help of their vampire father, escape the clutches of the enormous ghouls who want to adopt--and eat--them.

After the Mandible sisters kidnap his sister, Wally seeks the help of a group of orphans and his vampire father.

Zack feels that a supernatural force is at work in his apartment when he encounters floating television sets, pancakes that flip by themselves, and a ghost named Wanda.