Season 1
Sergeant Keroro, who is ”58th Planet of the Gamma Planetary System, Space Invasion Army Special Tactics Platoon Leader,” infiltrates the Hinata family's home as a preparatory stage to conquer Earth, but is easily captured by Fuyuki and Natsumi due to his inherent incompetence. Keroro ends up staying in the home of the Hinata family thanks to Fuyuki's generosity, or perhaps simply out of his curiosity. As they pass the days keroro and his four subordinates together plot to conquer Earth, or maybe not.
episodes
Fuyuki and Natsumi Hinata are introduced as they wake up to find a mischievous Sgt. Keroro spying on them.
Fuyuki and Natsumi Hinata are captured and tied up by Keroro; Aki Hinata is introduced.
Keroro has his own bedroom. Aki tasks Fuyuki with observing Keroro, who is doing his own counter-surveillance.
Keroro helps clean the house with Natsumi and Aki, an then helps Fuyuki clean up his rather large book collection.
All 5 members of the Keroro Platoon are reunited, and are tasked with rescuing Fuyuki and Natsumi from a strange alien.
Saburo uses his VR pen to transform Natsumi into Super-Natsumi, who then battles with the Keroro platoon.
Fukuki and Natsumi are skipping rope when Koyuki and Dororo appear and join the fun. Tamama and Giroro try too, and Keroro, with Kululu's help, skips rope into space.
Fukuki wins four tickets to a spa; one for each member of his family with one extra. Koyuki and Momoka fight over which of the two would claim the extra ticket.
Shin Keroro appears and becomes good friends with Tomosu.
Tomosu, Fuyuki, Kaneami, Natsumi, Shin Keroro, and Keroro all play a special space game, where they are shrunk down to play as the board pieces.
Angol Mois and the platoon play a prank on Keroro. Kululu invents stickers that give objects and Keronians a new personality.
The Keroro Platoon participates in a new training regiment designed to research how Pekoponian children grow up in Kindergarten.
Between extreme training regiments, the ARMPIT platoon takes care of a Dolphin that has the power to fly.
Black Star appears and transforms into the entire Keroro platoon. Shin Keroro chases and battles him, but he vows to get his powers.
Black Star sends a Fake Keroro Platoon to challenge Keroro. Keroro quickly defeats them and impresses Shin Keroro greatly.
