Gan to Gon (partially found anime series; 1971)
Gan to Gon (ガンとゴン Gan & Gon) is a Japanese children's comedy anime series produced by Jiho Eigasha (who produced the notoriously difficult-to-find anime series, Hoshi no Ko Poron) and animated by Nihon Douga. The anime was aired from April 5, 1974 to August 13, 1975, for total of 260 episodes at a length of around five minutes each.
Unlike Hoshi no Ko Poron, which had a strong educational feel, this series is a surreal gag anime.
Gan and Gon are a pair of oddballs on a worldwide search for treasure. Gan is an unsightly kind-hearted man of justice who loved adventure but was a bit scatterbrained. Gon only thinks about sleep but, when it comes down to it, he would come up with some really crazy ideas.
While some episodes of Hoshi no Ko Poron were found and uploaded to Internet in full (except for one episode of which the first part is missing), no full copies of Gan to Gon episodes were known to exist. However, a copy of a episode of Himitsu Sentai Gorenger was found in the possession of a user named morikawa confirming that at least one Gan to Gon episode still exists.
During a Niconico stream on December 24, 2016 called "Hoshi no Ko Poron livestream", a episode called Protect the Oasis was revealed. It was later confirmed that something appearing to be the master copy has been bought on Yahoo! Auctions Japan.