Answer
The Adventures of Jo, Zette and Jocko was the third series of comics created by Hergé, following Tintin and Quick & Flupke. It was published in 1936 and 1937 in the Belgian newspaper Le Petit Vingtième. The series tells the story of three young siblings who travel the world and have adventures. It was not as popular as Tintin, but it was still well-received by critics.