Digit and Nolik built a rollercoaster that will be ready to ride after safety testing is completed. Digit leaves to bring back equipment for the test and tells Nolik not to play with the rollercoaster while he is gone. Tweak and Geek see the rollercoaster and pressure Nolik to let them have a rid...

Right after Digit repairs Katya's air conditioner, Tweak and Geek get into an argument about whether the room should be hotter or colder. Their argument leads not only to them breaking the unit's remote, but the air conditioner itself.

Tom Thomas' mom asks him to throw away things he no longer needs in his cluttered room, but it proves very difficult for him because of all of the memories attached to them.

When Tom Thomas plays an April Fool's trick on Katya she gets the hiccups. Nolik and Simka try to help her get rid of them.

Nolik thinks everyone has forgotten his birthday. To make matters worse they all seem to be making fun of unfortunate mistakes he made in the past. Could everyone really have forgotten Nolik's special day?

After having a lesson on energy conservation at Fixie School, Nolik tells Simka, Freak, and Tweak he can't do his chores today because he needs to save energy.

Tom Thomas is frustrated he missed getting a picture of a bird with his smart phone because he had to take off his gloves. Simka helps him make a pair of gloves that will work on a touch screen.

After agreeing to help Professor Eugenius test out his x-ray machine, Elisa is frightened when the x-ray of her hand seems to show gears inside. How could she know that the gears are just Tweak and Geek trying to take x-rays of themselves?

When Nolik wishes Fixies had Santa Claus like humans do, Basiya and Grandpus plan to surprise him. But things get confusing when both Basiya and Grandpus arrive dressed up like Santa.

When Tweak and Geek learn that Professor Eugenius has not congratulated Elisa on her PhD, they order flowers online, unaware of the money they are charging to the Professor's credit card.

Wanting to get their own pack-o-mats, Grandpus devises a test for Tweak and Geek to construct a minature power plant. The winner will get the one pack-o-mat he has available.

After learning that Digit got time off of school for making an invention, Freak and Tweak claim to invent a perpetual motion machine so they can get time off as well. Digit thinks it can't be real, but is unable to figure out how they might be faking it.

Nolik, Fire and Digit notice Tweak and Geek acting very strangely, using words they have never heard before. Fire is convinced the twins are up to no good and must be stopped. Digit figures out that the twins are actually speaking in code.

Eugenius creates a recycling machine. Nolik thinks the machine is just a trick and flies inside to investigate. Eugenius, Simka and Toola are soon frightened that Nolik got recycled into a shoe.

When Geek gets his head stuck inside a pencil eraser he climbs on the back of Tweak to carry him to Basiya for help.

Professor Eugenius ask Tweak and Geek to stop dancing in his laboratory because he thinks science and dancing don't mix. Tweak and Geek think Professor Eugenius actually doesn't know how to dance and they challenge him to prove otherwise.

The Fixie kids are really excited to have Fire take their pictures and edit them in his photo editing program until they see the results of his "artistic" choices.

When Nolik offers to help Katya fix her broken electric piano, he discovers that there are two Fixies living in Katya's apartment, Tweak and Geek . Nolik convinces the twins that it is safe to reveal themselves to Katya.

Katya, determined to stay up all night to meet the Tooth Fairy after losing a tooth, makes it difficult for both her Mom and Basiya to deliver her a gift.

On their first day of Fixieschool, Tweak and Geek play a trick on the other Fixie kids who have not met them yet pretending that one of them is actually a copy made in Professor Eugenius' 3-D printer.

Tweak and Geek convince Nolik and Simka to do some parachuting with them instead of going to Fixie School. Wondering why they have not shown up for class, Grandpus tracks them down in Tom Thomas' apartment and meets the twins for the first time.

Grandpus and Basiya's first meeting is rather tense when the two of them get into an accident as a result of a prank Tweak and Geek played with a hook on Grandpus' Fixieboard.

Once on a winter day someone knocks on Tom Thomas’ window. He, Simka and Nolik see a cold and hungry little bird on the ledge. The friends decide to help her and so they build a birdfeeder out of materials sitting around the apartment. For food, they take some bird food from their parrot, Adisa. ...

Nolik wants to join his Simka and go to the laboratory of Professor Eugenius to complete an important task she will be doing with Fire and Digit. Simka doesn’t want him to go because she thinks he is too impatient to handle the work. Nolik wants to prove to Simka it isn’t true and asks her to giv...