Oh this day in 1936, Hergé followed up his hit Tin Tin with another adventure series, Jo, Zette, and Jocko. The strip was plagued with restrictive story lines — unlike Tin Tin, siblings Jo and Zette (and their pet monkey Jocko) had parents and could not go bounding off on adventures of their own. It also lacked the political and social messages of Tin Tin and was therefore not as popular. The comic lasted until 1958.