Ep. 4: Giroro sets traps for the Hinatas while Keroro becomes berserk due to humidity changes.
Aired on April 24, 2004
In the first segment, Giroro grows frustrated with the invasion's lack of progress and sets traps for the Hinata family using gathered intelligence. He immobilizes Keroro and Fuyuki, but Natsumi easily defeats the traps with brute strength and knocks out Giroro. In the second segment, Giroro suspects Keroro's lost interest in the Pekoponian invasion stems from humidity differences between Earth and Keron. He and Tamama install humidifiers in Keroro's room, which drastically increases his intelligence and strength. However, rain causes the room to become overly humid, making Keroro go berserk. A Nyororo, a natural enemy of the Keronians, is attracted by the humidity and feeds on the moisture Keroro absorbed, returning him to normal.
Episodes
- Ep. 1 · Sergeant Keroro, a Keronian alien, is captured by the Hinata family and forced into domestic servitude on Earth.
- Ep. 2 · Keroro Robot Activates, Sir! Cherry Blossom Invasion Front, Sir!
- Ep. 3 · Pururu serves as Chief Nurse, Sir! / Natsumi shares today's horoscope, Sir!
- Ep. 4 · Giroro sets traps for the Hinatas while Keroro becomes berserk due to humidity changes.
- Ep. 5 · Keroro: Heated Card Battles, Sir! / Keroro: The Targeted Platoon, Sir!
- Ep. 6 · Momoka: The Best Mother's Day, Sir!
- Ep. 7 · Putata and Mekeke: Mastering the Art of the Signature Handshake, Sir
- Ep. 8 · Chibi Kero: The Past Joriri, Sir!