Sgt. Frog Episode 65: ET: The Extra-Special Terrestrial
Episode 65 of 358 of Sgt. Frog, aired July 1, 2005, 25 minutes. Available with English subtitles and dub where released.
Episode summary
The Keroro Platoon is on the case! Vicious space criminal #303 has come down to Earth, and they`re going to track him down. But what are all these strange rings they keep finding, and are they clues to his true identity? Source: crunchyroll