Um sich besser gegen seine Schwester durchsetzen zu können, läßt sich Dexter einen furchteinflößenden Bart wachsen – mithilfe einer speziell konstruierten Maschine. Nun sieht er aus wie sein Held Action Hank. Ob das nur Vorteile für Dexter hat?

Nachdem Dexter sein Gehirn mit demjenigen einer Maus ausgetauscht hat, gerät er in eine Auseinandersetzung mit seiner Mutter, die keine Mäuse im Haus duldet …

Als Dexter mit anderen Nerds ein Rollenspiel beginnt, beschweren diese sich bald über seine ehrgeizige Art. Doch dann nimmt auch Dee Dee daran teil …

Im geheimnisvollen Land Koos gibt es einen König. Doch ist Koosy wirklich dieser König, wie er Dee Dee gegenüber behauptet?

Während eines Ausflugs mit der Familie geschieht Dexter ein Mißgeschick: er läßt Dee Dee mit dem Wagen verschmelzen …

Dexters Schuhe müssen dringend repariert werden. Dafür ruft er die Schuhzwerge zu Hilfe, doch die wollen nach getaner Arbeit nicht mehr gehen.

When Dexter's friends tire of the complicated traps he sets up as Dungeon Master (he has their character's killed every time), they put Dee Dee in charge for a change of pace.

Dexter's father gets challenged to an arm wrestling match against a local champion at a truck stop, when he causes the champion to lose for the first time, but refuses to do so even when he trashes the family car. He finally accepts the challenge when he slams the door in Mom's face. Dee Dee knows he'll get creamed, so Dexter builds him a robotic arm to help him win the match.

Beim Sport im Schnee schneidet Dexter im Vergleich zu seiner Schwester recht mäßig ab – daher wird er vom Vater trainiert, damit er bald ein so toller Sportler wird, wie es der Vater einst war.

Dee Dee's imaginary friend comes to life and annoys Dexter. Dexter ends up wishing him away, then he realizes he made a terrible mistake.

Dexter oversleeps and still has to finish his homework along with getting ready for school and eating breakfast, so he creates a helmet that expands thirty seconds into thirty minutes, but realizes that slowing down time is more detrimental than helpful. When he gets everything done, the helmet shuts off. But Dee Dee blocks his door causing him to miss the bus. When Dexter asks Dee Dee why, she replies "Snow Day, school's canceled!". Dexter realizes he did all that rushing around for nothing!

Dee Dee Locks and the Ness Monster—Dexter's mother forces Dexter to read to Dee Dee when she's sick, but she makes up her own story after being bored by Dexter's story (which was actually a science article). The story is completely mixed up and makes no sense. Dexter ends up catching Dee Dee's illness.

Dexter fuses Dee Dee with the family car by accident, causing mayhem. A Parody of Herbie the Love Bug.

Wie alle anderen Kinder auch, setzt Dexter mit der Zeit Schmutz an und muss in die Badewanne. Um die Tortur zu vermeiden, überlegt er sich einen technischen Trick …

Dee Dee's new dance annoys Dexter to no end.

Dexter ist derart neugierig auf sein Geburtstagsgeschenk, daß er sich unsichtbar macht. So kann er seine Eltern beobachten.

Dexter ends up in the "old part of the lab" where his earliest inventions, long since forgotten, are not too happy to see him. They are mad at him for saying they were his greatest inventions, then moved on to another great invention.

Dexter and Dee Dee label everything in the house. When their parents get home, they mistake Dexter for Dee Dee (he had a Dee Dee label on his forehead), but he already blamed Dee Dee for the chaos.

Dexter and Dee Dee compete against each other on a game show. Where Dexter can't seem to win.

Als Dexter und Dee Dee einen Film mit Altersbeschränkung sehen wollen, versuchen sie mithilfe einer Erfindung schlagartig älter zu werden. Doch der Versuch mißlingt: ihre Umgebung wird bloß jünger …

Sport zu treiben kann so schön sein, meint Dexters Vater, und versucht, seinem Sohn einige Sportarten nahe zu bringen. Doch Dexter ist da völlig anderer Meinung …

Die Geschwister Dexter und Dee Dee beobachten, wie gerne ihre Eltern den energiespendenden Kaffee trinken, und – werden selbst koffeinabhängig!

Der Schulleiter hat wegen Dexter dessen Mutter zum Gespräch geladen. Doch Dexter scheut diese Begegnung so sehr, daß nun sogar eine neue Mutter her muß: Dee Dee!

Burritos schmecken köstlich – sogar Dexter schätzt sie. Doch nun erwischt er ein mexikanisches Fladengericht, nach dessen Genuß er glaubt, er würde nur noch kurze Zeit leben …

Als Dexter mit seiner Familie einkaufen geht, verwechselt er seine eigenen Eltern mit fremden Eltern – und die beiden Elternpaare verwechseln ihre Kinder. Wird nun alles besser?

Als ein galaktischer Regen von Meteoriten die Existenz der Erde bedroht, gibt es keine andere Alternative, als daß Dexter und sein Konkurrent Mandark zusammenarbeiten …

Am Mount Rushmore überblicken die Gesichter der wichtigsten US-Präsidenten das Land – überlebensgroß und in Stein gemeißelt. Dexter und Mandark sorgen für Bewegung …

Dee Dee steals the nuclear atom that Dexter needs to make his invention work, but she doesn't know that it will explode if Dexter doesn't find it on time.

Wer hat das Feuer entdeckt? Diese Frage läßt Dexter keine Ruhe – und so reist er in die ferne Vergangenheit des Menschen …

Als Dexter und Dee Dee Zimmerarrest bekommen, weil sie einen Pokal ihres Vaters zerstört haben, bangt vor allem Dexter um die Unversehrtheit seines Labors …

Da Dexter etwas seltsam spricht, wird er zum Opfer eines Rabauken in der Schule …

While at the beach, Dee Dee (who's wearing a mermaid swimsuit) gets captured by a maniac sailor so Dexter must rescue her.

Ein Elektriker repariert einige Installationen im Haus – und auch in Dexters Labor wäre seine Hilfe von Nöten …

Dexter hat einen Gürtel mit dessen Hilfe er sich in der Zeit vor- und zurückbewegen kann. Dies führt zu einigen Problemen, da nur er sich so bewegt, während alles andere normal weiterläuft …

Als eine Insel und ihre Bewohner von einem Vulkanausbruch bedroht werden, starten Dexter und Dee Dee eine gigantische Rettungsmission …

Dee Dee ist der Star des Ballettkurses an ihren Schule. Als ein mysteriöses Mädchen auftaucht, das ebenso gut tanzt wie Dee Dee, verlangt die Lehrerin, dass die beiden zusammen auftreten. Um die Konkurrentin auszustechen, bittet Dee Dee ihren Bruder Dexter um Hilfe …

Dexter must stop Dee Dee from showing some pictures (that she took earlier in Dexter's lab) to Mom.

Mandark behandelt seinen Roboter Computress sehr schlecht – und wirft ihn am Ende hinaus. Mit Dexters Hilfe will sich Computress nun rächen.

Blue Falcon bittet Dexter, seinen Dyno-Hund zu reparieren. Doch stattdessen baut Dexter einen neuen Hund, der leider nichts richtig macht …

Dexter and Dee Dee get their Action Hank and Pony Puff Secret Codes mixed up.

Dexter newest creation gives Mom super powers.

Dexter's robot takes over his lab.

Dexter heals a turtle by giving him loads of modern, techno stuff.

Dexter makes himself invisible to make sure Mom and Dad give him what he wants for his birthday, the Ultimate Mayor Glory Action Figure.

Dexter and Dee Dee go to South America in order to find the chupacabras, an animal that Dexter created.

Dee Dee, who's not exactly good at singing, gets Dexter's help on getting a better voice, but not the voice Dexter was expecting.

When Dexter's favorite show gets interrupted by an emergency, he searches all town trying to find it and solve so regular broadcast returns.

Dexter and Dee Dee go to the dumps to retrieve Dee Dee's lost teddy bear.

Dexter and Dee Dee get trapped with a Finger trap.

Dexter and Dee Dee must stop Dad from eating Mom's muffins.

Dexter finds out he's ugly, so he transforms his face to look better for the school photo.

Dexter combines himself with bubble gum to become more stretchable.

Dexter is send to detention after a confusion during a test.

Dexter and Dee Dee want to become older, but instead they make everyone else a baby.

A new female villian named Peltra wants Monkey's Coat.

Dee Dee, LeeLee and MeeMee become crimefighters, but of course they will not actually fight crime.

Dad wants to show Dexter the joy of sports.

Koosy tells Dee Dee that he is the king of the land of Koos, but when Dee Dee goes there...

Dee-Dee refuses any kind of help from Dexter on her science project, when Dee-Dee shows Dexter her show-and-tell product, he criticises it heavily and offers his own..contributions

Surprised of the results coffee causes on Mom and Dad, Dexter and Dee Dee decide to try it themselves.

Dexter uses his science to turn Dee Dee into a horse.

Dexter overloads the energy of the laboratory, so he makes numerous tries to reload it.

After Dexter did something really bad at school, he gets her mother called, so to not ruin his reputation, he turns Dee Dee into Mom.

After Dexter gets bitten by a clown, he turns into one every night.

On his way home, Dexter gets followed by a labrador, when he teaches him to speak, the dog becomes even more annoying.

A confusion at the supermarket makes Dexter go home with a different, yet extremely scientific, family; but who is home with his real family?

Dexter is afraid of taking a dive at the pool because Dad always pushes him.

After Dexter eats a giant burrito he believes he's going to die, so he makes a list of everything he must do before that time comes. (Including, make Mom and Dad happy, do dishes, free Robots, make World Peace, end World's hunger, learn to dance, make Dee Dee happy, shut down the Main System... and tell Mom and Dad about the secret laboratory).

Dexter and Mandark must team up in order to save the Earth from a meteor rain.

After an I.Q. test defines Dexter as ""average"", he decides to live an average life hanging out with an average boy of last name Smith.

Dexter and Mandark mechanize the giant figures of Lincoln and Washington from the Mount Rushmore statues and wreak havoc with them.

Dexter creates a small bug that eats all the scrap metal caused by Dee Dee's destruction.

Dexter's untested formula causes all plants in the garden to become dangerous.

After Dexter returns a bunny to a little girl with big round eyes, she starts following Dexter everywhere.

After Dexter ""fires"" Dee Dee, he realizes that his lab needs chaos.

Dexter travels to the past to meet the caveman that discovered fire.

Dexter attempts to make numerous accidents to get super powers.

Dexter goes to Mars to find alien life forms.

Dee Dee and the Ninja Clan battle for who delivers the newspapers in the neighborhood.

After Dexter and Dee Dee destroy Dad's bowling trophy, they are sent to each other's room.

Dee Dee builds a treehouse in the garden and Dexter can't stop wondering what's up there.

Dexter worked all night on his inventions so all he wants is some sleep, but Dee Dee will make sure that that doesn't happen.

Dexter and his friends Lucky and Pierre(¿?) are victims of a bully that hates kids with funny accents.

Numerous factors like getting up early, being the first ones there, fishing clothes and other accesories, will not allow Dexter and his Dad to go on a fishing trip.

Constant interruptions by Dexter, Dee Dee and Mom will not let Dad watch his golf game.

After Dexter breaks his glasses, he starts a new fashion at school.

Dexter meets a bum at an appliance store with a strange device on his head.

Dexter goes to the appliance store to buy a lightbulb for his lab.

Dexter takes piano classes from a man that looks a lot like Paul Williams.

When an electricist comes to repair the house, Dexter discovers that if he repairs the lab it will function perfectly.

Dexter creates a belt that can have its wearer do everything backwards,only to get in trouble when Dee Dee manages to get control of the time directional switch.

Dee Dee keeps getting into Dexter's lab even though Dexter keeps throwing her out.

Mandark tries to impress Dee Dee by getting into a surfing contest.

Dexter makes Dee Dee a robot for herself, at the same time a volcano is going to burst on an island in the middle of the ocean.

Dexter must save his family after they get possesed by aliens.

Dee Dee must save Dexter who is a slave in a distant galaxy.

Dee Dee and Lalavava (Mandark's sister), compete on a ballet contest.

It's Mother's Day and Mom can't take that Dad, Dee Dee and Dexter do all the housework.

Dexter and Dee Dee compete in various games chosen by Dexter.

A documentary shows the secret lives of Dexter and Dee Dee, also known as Blackfoot and Slim.

Dexter stays at school too much, forcing the janitor to stay as well, so he waits for a day in which Dexter has to leave early for an emergency, as he plans his revenge...

Dexter must stop his mechanical parrot before his imitations reveal the secret of his lab.

Dexter and Computress team up in order to shrink Mandark's head.

Krunk gets a nacho stuck in his tooth and Mayor Glory wants to take it out himself while Valhallens insists on taking Krunk to the dentist.

Dexter must prove to Dee Dee that Santa Claus doesn't exist.

When Blue Falcon appears with a destroyed Dynomutt, Dexter decides to build a new one.

The story of how Dexter was born and how he built his lab, in the style of a musical.

Dexter must save Japan from being destroyed by a monster, but his robot must be controlled by four people to function correctly, so Dexter must tell Dee Dee... and his parents.