Senbei creates Arale and takes her on a test-run as a convincing little sister. However, she's not as tuned-up as her creator would have expected. / Arale is enrolled in school, and tries to win over the "tough kids" Akane, Taro, and his little brother Peasuke. Meanwhile, Senbei gets a crush on his creation's homeroom teacher, Midori Yamabuki.
Arale's superhuman strength gets word around the school, and all the clubs want her to join them. / Arale comes home to tell Senbei that an integral body part is missing on her body, to which the doctor invents x-ray specs for definitely-not-perverted research purposes.
Senbei tests out his newest invention: an alarm clock-shaped time machine called the Time Slipper. On its inaugural voyage, Arale gets lost in ancient Japan. / Arale and friends use the Time Slipper to go back to the days of the dinosaurs, and find a mysterious egg.
The babylike creature that hatched from the prehistoric egg, Gatchan, is the subject of several discoveries for Arale and Senbei. / A day in the life of Gatchan, as they go about town interacting with the Penguin Village citizens.
Arale rescues a bear, but trouble is afoot when her new friend is to be released back into the wild. / Senbei creates a raygun that can make things bigger or smaller than their intended size. Naturally, Arale causes some mischief with it.
Arale tells Senbei that her teacher is coming for a home visit. Knowing he has to look his best for Miss Yamabuki, he creates a barber robot to spiff him up. / Criminal Joe Dunn holds Arale and Gatchan hostage, but doesn't realize that he's underpowered compared to the two little terrors he's kidnapped.
A day in the life of Arale, from her police car destructions to her school life, and home again after accidentally eating whiskey bonbons.
The tricky fox Donbe uses his kitsune powers of transformation to pull pranks on the town. When he runs into trouble, Arale and Senbei must put their differences aside with the critter who caused them too much trouble in one day.
Arale reveals to Senbei that Miss Yamabuki wears strawberry-patterned panties. In a fit of pure horniness, he enlists the help of the animals of Penguin Village to get him a peek.
The alien King Nikochan and his assistant abduct Arale and Gatchan, with the expressed intent to destroy the world. However, Gatchan's appetite for metal causes their ship to crash, which leaves the two invaders seeking help from the earth people.
Arale meets five-year-old Kinoko, a self-professed hip girl who only loves the most in-style of things. / After being accosted by a threatening female police officer, Senbei creates an invisibility potion to evade her.
Senbei creates a tanuki-themed raygun that can turn anyone into anything the wielder desires. In Arale's hands, trouble ensues. / Arale wants to fly in the sky like Gatchan, so Senbei creates a flying machine for her. But, in her soaring endeavors, she inadvertently bugs Raijin, the deity who creates storms and thunder with his drum set.
Arale, misinterpreting Miss Yamabuki's lesson on being a good kid, spreads chaos with the intention of goodwill.
Kento Kuraku is no ordinary man. After he eats his favorite pickled plums, he turns into Suppaman, a not-very-helpful superhero who causes more problems than solves. He, in turn, catches the attention of Arale.
After seeing Akane's bra in the changing room, Arale wants one for herself, not realizing that she doesn't need it. / Arale and pals take an excursion to safari park Wildland, but get into some trouble when their jeep breaks down.
Senbei invents a camera that can take pictures of the future. When Arale plays with it with her friends, they grow suspicious about the fact that she never seems to age in any of the pictures. / Arale and Akane swap lives for the day.
Trampire, a buxom bloodsucker, along with her assistant Franken, terrorize Penguin Village in search of her favorite treat. When she gets to Arale's house, however, the tables are turned.
Senbei's newest invention allows the user to enter books and interact with the characters as part of the story. When Arale enters the world of Momotaro, her decisions cause the tale to go wildly off-course. / Joe Dunn hires hitman Bibiruman to take out Arale, but her would-be killer gets sucked into her King Kong book with the Fairy Tale Machine.
Arale uses the Time Slipper to go for a swim "a long time ago". When she takes too long to return, Senbei starts to get worried.
After Kinoko's dad eats the strawberry off her cake, she, in a fit of anger, decides to run away and become a juvenile delinquent.
Senbei, Arale, and Miss Yamabuki take a trip to the stars in Senbei's spacecraft. However, his decision to not install a bathroom ends up getting Yamabuki kidnapped on an alien planet.
On the return back from last episode's space adventure, Senbei discovers that Akane and Taro have grown old. They say it's been 50 years since he left the planet, but could there be more to the story?
Arale goes on a date with the tough Banchou. Her definition of a date is just holding hands, though. Very tightly. / Senbei tries to scale back Arale's strength as to not cause any more destructive trouble.
After a cricket leaps into Arale's mouth, her personality changes, giving her much more common sense and manners. This starts to freak everybody out.
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