The comic has also, on several occasions, been turned into animation. The first time was allegedly a low-budget Danish production on 13 episodes in the 60's, known from a contract between Statens Filmcentral and Illustrationsforlaget, although not much is known about this production. In 1984, a new series on 13 episodes was produced, as a deal between PIB Copenhagen and Casterman in Belgium, and was animated by an American living in Japan. It was still low-budget, but was a reasonable commercial success being shown on several television channels worldwide. In the 1990s, yet another series materialised as 26 5-minute episodes for two periods, 1996 and 1998. This was a European co-production involving Danish animation veterans A. Film.