Episode 295-A of Sgt. Frog titled "Keroro, The Two of Us are One Kerororm" (ケロロ 二人が一人ケロロ〜ム! であります, Keroro Futari ga Hitori Kerorōmu! de Arimasu?) features the members of the Keroro Platoon finding an artifact that allows two of them to combine into a single Keroro, each with new powers. The episode title is based on Kamen Rider Double's catchphrase and the resultant transformation resembles that of Kamen Rider Double (the characters appear to be split down the middle, with one side being, for example, Keroro and the other Tamama).