Supersnällasilversara (Super-nice Silver-Sara) is a very kind superhero and loves collecting things, helping children and missions.
Stålhenrik (Steel-Henrik) is a superhero who is strong and unable to beat, because he is hard as steel, but he's a little bit afraid.
He likes telling about the adventures from his and Supersnällasilversara's years as young in Hjältedådsboken (the Book of Heroism) for their granddaughters Vega and Nova.
Vega (Kajsa Halldén) and Nova (Mathilda Thofte) are granddaughters to Supersnällasilversara and Stålhenrik and daughters to Stuntstina.
Gjerta is a super-villain who occupies the child-organization Barnverket and wants to stop the children's laughing and fixes a gang with villains who can help her.
Earlier he was a tightrope walker but he was always falls down because he is so clumsy (Swedish: klantig) and then people laugh to him.
(Supersnällasilversara) "Jag orkar inte vara snäll och fin hela ti'n!"
Stålhenrik and Supersnällasilversara start to read about their adventures as young in Hjältedådsboken (the Book of Heroism): Stålhenrik's parents left him alone on the Moon when he was big as an adult and his mission is to fly to the Earth and help children in case of emergency but he can't fly!
And Stålhenrik also tells about how the adventure started: An organization, called Barnverket, who worked for making everything good for children, changed chief and the new chief was Superskurken Gjerta (Gjerta, the super-villain) who had dressed up herself as a woman called Gudrun.
He learns how to love animals and gets a punishment; he must take care of the pets when the children are in school and their parents are busy with working.
Supersnällasilversara and Stålhenrik find Anna Flabet at the library where she is on the roof and is going to reverse the letters of every word in the whole world with a dish.
They go to a circus and then Supersnällasilversara laughs to Klante who can't walk upstairs without falling, and when he shows the spray-machine, they understand that he is the laughing-vandal.
Klante calls Supersnällasilversara "stupid" so she becomes transformed to Supersurasunksara, who runs after him into the circus tent, where he walks on the tightrope, trying to escape.
Then Gjerta becomes angry and gives the Tinnitus Triplets a machine which is able to make the whole world quiet from music and sounds.
Supersnällasilversara and Stålhenrik sing with the children but when the Tinnitus Triplets activate their machine it is quiet and crunching.
The Tinnitus Triplets call Supersnällasilversara "stupid" so she becomes transformed to Supersurasunksara, who forces them to stop destroying sounds, but it is impossible for her to hunt 3 villains.
The villain Frigolit Fragile thinks children, who run and destroy in his house of cards-museum, are stupid and wants to wake them up during the night.
When Supersnällasilversara and Stålhenrik have discovered Frigolit Fragile, he escapes with his truck, but the superheroes follow it in the air and land on it.
They come with him to his museum and then Supersurasunksara destroys a house and shows how to build it up and Stålhenrik fixes the problem.
When Uni Sax continues with her TV-program, she says "stupid" and Supersnällasilversara, who hears it when she watches the program with the children and Stålhenrik, becomes angry and transformed to Supersurasunksara and forces Stålhenrik to come with her to Barnverket, where they find Uni and her little box with finger dolls, which are the same as Uno, is a proof.
She and the superheroes broadcast a funny TV-program and Uni brings the clothes and toys back to the children, but Gjerta, who now is alone, makes a machine which she can use to speak with Supersurasunksara's own voice.
Vega and Nova thinks that Olga Hott on Julstjärnan is strange and they are spying at her house.
But they must escape when Olga Hott's coming, but Hustomten allows them to sit on his sledge and drink hot chocolate milk.
Gjerta, who knows that Vega and Nova have betrayed her, forces them to come with her down to a big cellar, which is the machine room of Julstjärnan.
First she thought the code was "Påskhare" ("Easter Bunny"), but later she knew that it was "Jultomte" ("Christmas Father").
After that she shows Vega and Nova the Julstjärnan-ball, which prevents Julstjärnan from leaving the Julstjärnan-orbit and disappear in the space forever.
Nova hangs on her back and they fly up from the cellar and shout to the other pensioners on Julstjärnan to trap Gjerta.
She tries to escape with her rocket, but the pensioners come and press it down and Gjerta's trapped, but she throws away the Julstjärnan-ball, but Nova can catch it with her mind now when her "thinking-power" is activated.
The next day Nova and Vega become dubbed to the superheroes Super-Nova and Mega-Vega, and at the evening Stuntstina, who has finished her missions, comes for pick them up.