Heart is a young girl car and she is only recently licensed. Just like any other cars new to the town, she has to go to the Auto Show to find her new family. But because of her small size compared to other bigger cars, she doesn't get chosen by anyone. Heart-broken and all alone, Heart runs into Hana, the mechanic, who is all dressed up for a day out.
Heart receives a cute siren as a gift from Hana. Lani, already envious of Heart, becomes even more upset when Heart gets all the attention from everyone. That evening, Heart's siren disappears! The little buses suspect Lani because of her jealousy for her.
Rubbi's cleaning equipment breaks down while sweeping up the junk that Rogi has collected at one side of playground. Rogi, responsible for the cause of the incidient, is given the task to take over Rubbi's job until the equipment is fixed. And Rubbi enjoys his first holiday in a long while, with his friends.
Tayo believes that he is familiar with his daily routine and that there is nothing to worry about as he is all grown up! Tayo is tired of Hanna treating him as a kid and wants to prove to her that he is not a kid anymore. One day Carry asks Hanna a favor to babysit Bongbong and other baby cars. Tayo confidently offers to babysit the baby cars wanting to show Hana that he is all grown up.
Tayo and the little buses are all geared up for their first day of school. On the driveway, Tayo runs into Teach who has just moved to the town. He finds out that Teach will be going to the same school he will go to. Excited to see a new friend, Tayo shows Teach around the town and then returns to the garage where he is told that the teachers at school will be very scary.
One day, Frank heads out to extinguish a fire on top of a skyscraper. While Frank is having trouble reaching the fire on the top story, Air appears and puts it out. From that day on Frank continues to train hard but ends up being distressed after failing again to extinguish a fire on a tall building...
The little buses are upset of not being able to share any interesting stories to the class when everyone else shares stories of their fun weekend. Tayo and his friends ask Citu to take them somewhere fun for the weekend. Citu, who hasn't been able to spend much time with them, decides to take the weekend off and take them to the zoo.
Tayo breaks his promise to hang out with Duri. He feels sorry and makes another promise to Duri that he will let him ride with Frank or Pat. However, his promises constantly fall through due to unexpected incidents.
One day, the popular action star Reo comes to visit the town. On his way to the city center, Leo gets stuck to the railroad and Gani saves him! Gani gains fame as a brave bus that saved a superstar and even gets a personal manager for himself. But alternating between his work as a city bus and other press schedules constantly tires Gani.
Bongbong rides on Toto's tow hook for fun and oh no, Bongbong gets stuck to Toto as the pintle breaks. Toto, already late for school, has no other choice but to take Bongbong along with him. Nevertheless, Toto contstantly gets into troubles because of Bongbong.
Pat always look around to make sure that all cars on the road are following the traffic rules and are driving safely. Well only to make sure everyone is safe! However, being the strict police car, the little buses and kindergartners get more and more scared of Pat. One day, a feather gets stuck to the back of Pat and he just can't control himself every time it tickles him...
peedy and Shine always cause troubles together. At school, Shine gets complimented along with Lani, Rubbi, and Toto. Not only are they praised together but they also share a common color, yellow. The four of them quickly get close and spend most of their time together. On the other hand, Shine's best friend, Speed, feels left out when Shine only hangs out with his new friends.
Cooku and Champ are visiting the town for the first time. Although Cooku has never been to the town before, she wants to show off that she knows everything. The two of them eventually end up in a weird, weird place. Where are they?And what will happen to them?
On her day-off, Lani spends the whole day taking a nap and can't sleep anymore. Instead, she watches tv all night. Next day, tired and super sleepy, Lani falls a sleep in class and just can't help falling a sleep during the day... What will she do?
Speed meets Heart for the first time and he wants to be her friend too! Vroom, vroom! Speed and Shine are playing tag in the garage. Driving too fast, Speed's tires go flat. Heart and Hanna come to help Speed. Speed instantly gets attracted to Heart, the pretty and kind pink car. He plans to become friends with her but oh no, it seems like things are not going too well for him!
Tayo and Duri are watching a Superhero movie on TV and they are blown away by what super heroes can do. Tayo and Duri coincidentally help a friend and told that they are just like super heroes and the two are delighted! The next day, Tayo and Duri dress up just like the super heroes from the movie and roam around the town offering helps to the people in town.
Joy the magician is having a "Joy's Magic Circus Show" with the world-renowned circus cars but it looks like the circus master can't make to the show anymore. Poco, Billy, Max and Chris are bored of their daily routine of work at the construction site. During a short break after work, they perform some acrobatics and they are pretty good! Joy the Magician is impressed at what they can do.
Have you guys ever wondered how Hanna get to work with Tayo and his friends? One of Tayo's handles got broken and Hanna replaced with....what? Let's find out! Back in garage, Citu tells Tayo how he first met Hanna and how she became a mechanic.
Tayo and his friends want a puppy in the garage but Hanna says that it is too dangerous. What will Tayo and his friends do? Let's find out! Tayo finds a lost puppy. Despite Hanna's warning that he shouldn't keep a puppy in the garage since it is too dangerous, Tayo can't let go of the cute puppy and bring him to the garage. In fact, he decides to keep it as a secret from Hanna.
Tayo and his friends say that Rogi can be silly sometimes. Rogi goes to Met to ask for help because Met knows everything! Do you guys think that Met knows everything? Let's find out! Rogi is made fun of at school because he gets the questions wrong and takes wrong roads to ride on. He goes to Met, the smartest of all and takes special lessons from him to get smarter. Rogi starts to gain fame.
Poco receives a flower seed as a gift from a girl that he helped. He does not take the tiny seed seriously at first but soon gets amazed of the growing sprout and becomes very fond of it.
Jingle bells, jingle bells! It's Christmas time! Santa Claus is coming to town and he knows when you've been bad or good! Tayo is extremely excited for Christmas and especially for all those presents! Has Tayo been a good boy this year? What about you guys? Will Tayo get a Christmas present from Santa or not?
Bully, the space pirate mistakes Hana for Princess Ray and comes to Earth and kidnaps Hanna instead. It looks like Bully and the gang has made a huge mess on Earth! The little buses all gear up with the help of Princess Ray and go on to rescue Hanna...
The little buses gear up with the help of Princess Ray and go to rescue Hana. Meanwhile, Hana fixes the wounds of Wooly, Bully's son, and discovers his warm hearted nature. When the little buses arrive at Bully's castle, barely escaping his soldiers to enter it, they fall into Bully's trap. Will they be able to save Hana?
Tayo and Rogi are playing pass-a-tire by the riverside park and they get into an argument. As both of them get angry at one another, they keep throwing the tire at each other and eventually the tire drops into the river. They go to the floating platform to fetch the tire and in fact, the two drifts down the river as the tide waves. Tayo and Rogi panic and call Bongbong for help when he passes by.
Tayo and his friends are divided into Team Blue and Team White for the school Sports Day. Unlike Rogi who is teamed up with all the atheletic friends, Tayo ends up in a team with Lani, Gani and others who aren't too good at sports. Rogi's team is as excited as if they had already won. Tayo and his team goes on a hard training session because Tayo doesn't want to lose!