The U.S. army invades Dexter’s lab under the mistaken impression that aliens are using it as a base of operations on Earth, and Dexter must convince them that this is actually his lab, and also has to keep this a secret from Dee Dee.

Mandark disguises himself as Dexter’s mom to get into Dexter’s Lab. Unfortunately for Mandark, he now has to deal with Dexter, Dad, and Dee Dee’s requests, which are too much for him.

Suspicious that Dee Dee has not entered his lab even once on a particular day, Dexter shrinks himself and enters her room to spy on her. He soon becomes an unwilling character in Dee Dee’s doll story, but he believes the story to be real.

Dexter and Dee Dee experiment with coffee after seeing how it energizes their parents in the morning.

After watching a horror film, Dexter and his father become easily frightened.

Dexter’s mother asks him to read a story to a sick Dee Dee. Dee Dee becomes bored of Dexter’s story and creates one of her own.

Dexter tries to emulate the barbarian hero of his favorite comic book.

Dee Dee’s new dance moves annoy Dexter to no end.

Monkey encounters an alien hunter named Huntor (Ed Gilbert) and must fight him to save Agent Honeydew and Commander Chief.

Dexter pirates cable for his father.

When Dexter gets amnesia, Dee Dee decides to play tricks on him by creating a whole new identity for him in her image.

Dexter finds out that all of Mandark’s plans are taken from a comic book.

When Dexter’s father tries to teach his son sports, he realizes that Dexter is not athletic.

Dexter and Dee Dee listen in on their parents’ conversation; they are playing Scrabble, but the way they talk makes it sound like Dad was cheating on Mom

Dexter’s parents and Dee Dee have their minds taken over by an alien life form that escaped from Dexter’s lab.

Following a mishap in his lab, Dexter ends up in the old, long-abandoned part of the lab, and discovers his early, neglected inventions.

Mandark’s sister Olga Astronomonov (a.k.a. Lalavava) tries to upstage Dee Dee at dance school.

When Dexter catches Dee Dee killing ants, he shrinks them both to take her inside an ant colony so that she can learn how organized the ants are.

Dexter reluctantly takes piano lessons from Professor Williams (Paul Williams), but when the Professor stumbles onto Dexter’s lab, he discovers that Dexter has more musical talent than he thought.

When Dee Dee hides the core of Dexter’s nuclear lamp, he must decipher her clues within one hour to find it.

After a crime prevention talk at school, Dee Dee, Lee Lee, and Mee Mee become crime fighters, but they unintentionally end up being neighborhood criminals.

Dexter tries to avoid being pushed into the family’s new swimming pool by his father, since he cannot swim and is afraid of water.

Dexter and Dee Dee protect their mother’s muffins from their muffin-loving father while she is out shopping.

Dexter and Dee Dee realize that they make a good team, so they decide to do stuff together, but doing so makes things worse.