The movie begins with Fuyuki and the Keroro Platoon exploring Machu Picchu. Keroro accidentally sets off a trap, and by chance they find a room with a large blue crystal in the center, on a stand that has a key in it. Keroro leans on the key, causing the room to activate and they run out of the room. Fuyuki catches a fleeting glimpse of Nazca as he is running out, and tells Keroro that there's a girl in the room, but he is forced to leave the room before he can say anything else.
ShortEditThe film included a 17-minute 3D short, similar to its prequel, named Warrior Kero: Debut! Sengoku Planet Ran Big Battle!!
There is also a game for the Nintendo DS based on the movie, entitled Keroro Gunso the Super Movie 3: Great Sky Adventure de arimasu!
- Chō Gekijōban Keroro Gunso 3: Keroro Tai Keroro - Tenkū Daikessen de Arimasu! (anime) at Anime News Network's Encyclopedia
- Keroro Gunso the Super Movie 3: Keroro Vs. Keroro--Great Duel in the Sky (2008) at Yahoo! Movies
- 超劇場版ケロロ軍曹3 ケロロ対ケロロ天空大決戦であります! at Wikipedia (Japanese)
- 케로로 더 무비: 케로로 vs 케로로 천공대결전 at Wikipedia (Korean)
- Keroro Gunso the Super Movie 3: Keroro vs. Keroro Great Sky Duel (2008) at Wikipedia