After being shrunk by a shrinking machine and ending up on a dog having a bubble bath, Alexander, his cousin Judy, and a tiny robot try to survive encounters with insects, soapy bubbles, and bathtub and toilet drains.

When ten-year-old Andrew invents a shrinking machine, he does not expect to be sucked into the machine along with his cousin Judy, only to end up in a dog's nose.

While trying to recover from their accidental underwater adventure, Andrew, his cousin Judy, and Thudd the robot are swallowed by a blue whale, the world's largest creature.

Still trying to save the giant squid from Soggy Bob, ten-year-old Andrew, his cousin Judy, and Thudd the robot nearly meet disaster at the Challenger Deep, the deepest place in the ocean.

After escaping from the belly of a whale, Andrew and his cousin Judy face more dangers from their underwater nemesis, Soggy Bob, in the Great Barrier Reef.

While bouncing through Earth's prehistory in a malfunctioning time machine, Andrew, his cousin Judy, and Thudd the robot meet Dr. Kron-Tox's nephew, Beeper, and nearly lose the Time-a-Tron in a tsunami.

Andrew, his cousin Judy, and Thudd the robot wind up at a garbage dump when Andrew's latest invention, the Goa Constrictor, shrinks them to the size of beetles and swallows them.

Lost in an Australian rainforest, Andrew, Judy, and Thudd the robot, who are still the size of insects, must evade Rhinoceros beetles, tarantulas, flesh-eating plants, and a host of other threats as they make their way toward the village where Uncle Al will meet them.

While in the Australian desert, ant-sized Andrew, his cousin Judy, and Thudd the robot are carried away by a dust-devil and face many dangerous creatures, from a flock of wild parakeets to a Perenti lizard, as they try to make their way back to Uncle Al.