List of Sgt. Frog episodes

"Meet the Sergeant!": Sergeant Keroro is a frog-like alien from the planet Keron sent to invade planet Earth (or Pekopon, as his race calls it). He is instead kept as a pet and forced to do chores for the Hinata family, which consists of paranormal maniac Fuyuki, his ill-tempered older sister Natsumi, and their manga-editing mother Aki. Keroro is given his own room in the basement of the Hinata family house, which he refurnishes and uses as a base, not realizing that the room is haunted by a ghost.

"Momoka & Tamama Present: Bag of Secrets!": Keroro goes to Fuyuki's school in search of the other members of his platoon. Meanwhile, Fuyuki is stalked by Momoka, a girl who had come across Private Tamama, one of Keroro's platoon members. Momoka tries to confess her feelings for Fuyuki, but is interrupted when Tamama farts while hidden inside her schoolbag. Momoka angrily attacks Tamama, but Keroro arrives and saves her before the seemingly helpless Tamama snaps and counterattacks with his laser breath.

"Amphibian on the Verge of a Nervous Breakdown!": Keroro feels trapped inside the Hinatas' house and misses being outdoors. Tamama and Fuyuki help him think of ways he can leave the house without drawing too much attention, given that he is an alien. Keroro eventually discovers that the badge on his helmet allows him to temporarily turn invisible.

"Giroro Presents: Blood Violence Death Kill!": Giroro is disgusted by Keroro and Tamama's lack of progress in the invasion, and decides to set traps for the Hinatas using all the information he had gathered on them. He immobilizes both Keroro and Fuyuki, but Natsumi easily overcomes the traps with her brute strength and knocks out Giroro.

Momoka invites Fuyuki to her private island resort for spring break so she can steal her first kiss from Fuyuki. However, Natsumi, Aki, and the Keronians come along and thwart her plans. She ultimately tries to pretend that she is drowning so that Fuyuki can save her and give her CPR, but Fuyuki reveals that he doesn't know how to swim. Momoka nearly drowns for real and is unknowingly resuscitated by an octopus-like creature brought by Keroro instead.

Angol Mois falls over the Hinata's house and reveals that she not only knows Keroro but she's here to fulfill the prophecy of the Earth's destruction. She's already years late however. A battle between Keronians, humans and Mois starts for the control of the Lucifer Spear that would grant the destruction, conquer or safety of the planet.

Keroro remembers yet again that he should be invading Pekopon so he convinces the Hinatas to do something outdoors while he and his platoon work in constructing a secret base.

Things are getting difficult for Keroro who realizes that the invasion needs someone intelligent so he orders to find the fourth frog Kululu. Meanwhile, Natsumi is approached by the popular Saburo who would like to hang out in her house for some reason. Fuyuki thinks it’s because Saburo is an agent hunting aliens, but in fact it’s because he found Kululu and it was time to reunite him with the Platoon.

Space idol Sumomo arrives at the Hinata's house to offer a private concert for the troops in Pekopon. This is actually a lie. In fact, she just wanted to rest from all the attention she gets. In the end, after passing an afternoon as an unknown human, she realizes that she misses that attention and abandons Keroro leaving him with a huge debt from the concert planning.

Aliens all over Pekopon are being abducted and a new girl is transferred to Natsumi's group. Both things are related as the new girl Koyuki is a ninja protecting Earth who also found the last frog, Zeroro. Koyuki transfer to Natsumi school where she met her for the first time. Teacher assign her next to Natsumi. Koyuki who want to be friend with Natsumi picked up that other kerons might be in Hinata household. She then informs Zeroro and tries to reunite them but Zeroro refuses, revealing to his old friends that he changed his name to Dororo and will now protect Pekopon rather than invade it.

After a freak accident involving Tamama's training machine, Momoka's two different personalities split up. The bad Momoka escapes the mansion looking for Fuyuki.

Dororo, Saburo and Tamama find Mois beating up people and head to the Hinata's house to investigate. Kululu shows all of them a video of Mois' activities which was supposed to be secret and a gift to her father. Mois walks on them and runs out of the house. The group runs after her to catch them attacking Natsumi's friends. Natsumi tries to stop her but Mois fights back. Then another Mois walks into the scene.

Keroro plans a trip to the school pool to test how good swimsuits actually stand against a Keronians. Once there Keroro challenges Natsumi to a swimming race which she losses.

Natsumi, Fuyuki, Koyuki and Mois go to a festival in which they find the Platoon scamming people. Keroro challenges Natsumi to a turtle fishing challenge to either leave the festival or keep her prisoner. Natsumi wins but Keroro has a plan B that involves the festival's fireworks.

Keroro decides to start the Peokoponian invasion by conquering the sea and the Hinatas tag along. Fuyuki meets a girl and both clean the beach until Keroro calls him to dive to the deeps of the sea to help him with a school research.

A power failure in the middle of the summer leaves everyone heat stroked. Koyuki teaches Natsumi ways in which she can stay fresh without electricity.

Space Detective Kogoro and his sister Lavie land in Pekopon and confuse Natsumi with random comments. They follow Natsumi to the Hinata's house looking for aliens that threaten the peace of Pekopon. The Platoon and the detective fight but only Keroro wants to fight. At the end the fight was staged because Keroro and Kogoro were friends since childhood.

Keroro gets a message from his father, telling him he is going to visit. To get the place prepared, he turns all of his friends into slaves.

Keroro and his friends have a regular snowball fight, but soon go to extreme mesures.

Because of her popularity, Natsumi is forced to do a horror version of Peter Pan with Koyuki. After training with Keroro and a few other aliens, Natsumi is ready to take on the part of Wendy. Seeing Saburo in the audience, she gets too lovesick and makes a fool out of herself. It's up to Keroro to save the show!

Private Taruru lands on Pekopon, and thinks Tamama is the sarge, due to some lies on Twitter. He makes hurtful jokes at all of Tamama's friends, and they all soon get revenge.

Keroro decides to attempt to grow his army by turning animals into soldiers to join the platoon. Things do not go as planned, as usual.

Fuyuki wins 4 tickets to a spa (from a game rigged by Momoka, hoping he would take her). However, Koyuki is invited instead. Meanwhile Keroro is determined to solve a rubix cube given to him by Natsumi in order to go.

After Fuyuki refuses to take him to the toy store, Keroro decides to get his revenge by putting them into a simulator that produces ice cold temperatures. However his plan backfires when Fuyuki and Natsumi are having fun, rather than suffering from the cold.

When Keroro finds himself in debt, he decides to open a ninja training school, with Dororo as the teacher. Since nobody shows up, Keroro decides to have Dororo teach the platoon the ways of the ninja, however they struggle to pay attention.

Christmas time is here, and Keroro plans on using this time to finally conquer the world. However, Keroro is worried that Santa Clause will be first to conquer the planet.

Keroro decides to welcome in the new year with many games, most of which involve using Giroro as a test dummy.

Keroro and Natsumi get into a heated debate over a very small problem. In order to solve the debate, Keroro and Natsumi play a game where they themselves are the pieces.

Keroro enters the platoon into the world cup, hoping to gain control of Pekopon. Everything goes well until Keroro kicks the ball into his own goal.

Keroro sneaks into Fuyuki's room and steals his Kero ball back. He uses it to invade the Hinata residence, trapping Fuyuki and Natsumi. However, Keroro runs into problems when Aki returns home.

Keroro, Fuyuki and Natusmi watch a television special on famous landmarks and whether or not aliens created them. Along with Tamama and Kululu, Keroro and Fuyuki visit the landmarks from the special and discover the truth behind each landmark.

Keroro, Tamama, Kululu, and the Hinata siblings investigate the story behind an unconscious Kogoro.

Each member of the Keroro platoon creates a beverage for a vending machine of Kululu's creation.

In an attempt to hastily write a report on Earth children, Keroro impersonates himself as a teacher and spends the day with Fuyuki's and Momoka's class.

The Keroro platoon sets out to find a dangerous alien responsible for destroying hundreds of planets so Keroro can gain prizes and recognition.

Keroro signs a deal to exchange two Earth humans for a ticket to a sports game on Keron with the Events Alien. The Events Alien ends up taking Natsumi and Fuyuki and Keroro, Tamama and Giroro set out to rescue them.

After hearing reports about an abandoned school building outside of town, Fuyuki and Momoka go to explore the building.

Karara and Taruru return to Earth for an arranged marriage between Karara and Tamama. Because of his feelings for Keroro, Tamama does everything he can to dissuade Karara from wanting to marry him.

Momoka makes lunch for Fuyuki, and invites him to go with her into space on a shuttle so he can eat it with her while watching a comet as a ploy to seduce him.

Keroro's excitement for his birthday soon melts into despair as he starts believing that his friends forgot about it.

A mishap with Kururu's latest inventions splits Giroro into seven parts of his personality. Mayhem ensues when Giroro's ruthless violent side, Giroppe, plans a hostile takeover.

Tired of Keroro's lazy ways, Giroro has Kururu invent a ray to turn the sergeant from slacker to stickler.

The Keroro Platoon turn into kites to take their invasion to the skies.

Natsumi ventures through the perils of the Keroro Platoon's base to rescue her prized autograph, with help from Koyuki.

Natsumi accidentally gives chocolate meant for Saburo to 556, and calls upon the rest of More Peach Summer Snow to help get it back.

Momoka tries to get the perfect picture of Fuyuki.

Momoka pretends to elope with Masayoshi in an attempt to make Fuyuki jealous.

Keroro takes vengeance on Natsumi by turning her into a dog.

In part A, the Keroro platoon opens a hamburger store. Everyone makes hamburgers of their own style, with Tamama putting a lot of sweet potato dangos in his burger, and Giroro putting gross ingredients in it, saying "If you can't even eat this, how will you survive on the battlefield?". Fuyuki and Natsumi help them too, Natsumi helps Mois with strangely selling "smiles" that give you motivation, and Fuyuki helps with burgers. However, Keroro orders new ingredients and has to pay a very huge amount of money for them. After doing that, they finally find out none of the burgers have been sold, but only the smiles have been selling, so the plan fails.

In part A, Fuyuki and Natsumi see Keroro sneaking around on the streets. When they think he's planning something suspicious, they follow him to a dead end. Fuyuki opens a closet, and falls into a hole along with Natsumi, leading to a secret city called "Alien street". They meet Keroro and the others there. However, Pekoponians are illegal in Alien street! They disguise themselves as aliens, and explore the city.

In part A, Keroro finds out Natsumi and Fuyuki have a health inspection on their school. Knowing this, the platoon invades the Health Inspection and punish the children in many ways. When Natsumi finds out, the platoon runs for it, but later gets caught by Dororo in a trap. Dororo reminds Keroro of him abusing Dororo in the Keron Army health inspection, and almost makes them suffocate, when Natsumi arrives and is about to attack. Keroro calls Dororo "most popular and loved dororo heichou", with Dororo getting all happy, not realizing he has been tricked. The platoon runs for it, with Natsumi chasing them. They get chased into the boy's changing room, where Natsumi can't go. Fuyuki accidentally gets knocked out of the door, and is seen in his underwear by all the girls on the school.

In part A, Tamama wakes up, seeing his tail is gone. Not knowing what this means, he asks the other members of the platoon, and they explain he has become an adult. When Kururu mentions that he's now ready to "Drink, hit, and buy", Tamama explores the adult part of Alien Street to find the meaning of it. In the end, it seems that while he was asleep, the "If you can live life over again gun" fell out of a closet and fired at Tamama, making him an adult.