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.

After being shrunk by a shrinking machine, Alexander, his cousin Judy, and Thudd the robot encounter drain flies, a cockroach, and worse as they work their way through Mrs. Scuttle's house toward safety.

Andrew, his cousin Judy, and Thudd the robot accidentally set off in Uncle Al's latest invention, a Volkswagen Beetle converted for deep sea exploration, and try to prevent the evil Soggy Bob from taking a rare ocean creature.

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.

When Uncle Al is kidnapped by Dr. Kron-Tox and sent to prehistoric times, Andrew, his cousin Judy, and Thudd the robot try to use Uncle Al's latest invention, the Time-A-Tron, to rescue him, and learn first-hand about the origins of the universe.

When Beeper accidentally releases the escape hatch to the Time-a-Tron, the time travelers must protect themselves from the world's most fearsome creature, Tyrannosaurus rex.

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.