L'Étoile mystérieuse
Other cameos in the "Adventures" include Auguste Piccard, whom the character Professor Calculus is based on (appearing in "The Shooting Star", page 21, frame 2, as the scientist on the far right) and Quick &amp; Flupke, characters in a separate Hergé series (appearing in "Tintin in the Congo", page 1, frame 1, as two boys in the group, and also appearing in "The Shooting Star", page 20, frame 8, as two boys running ahead of Thomson and Thompson, who are also making a cameo appearance in that book).