Mark Falconer (French: Marc Charlet) was a member of the Sanders-Hardiman Expedition.
When Doctor Simons calls to tell Thompson and Thomson about Professor Reedbuck being attacked, Tintin realises that the rest of the expidition is in danger. Mark comes over to Tintin 's house, but before he can reach there, on a taxi, he is attacked.
Like the other members of that expedition he fell victim to an Incan curse which put him into a deep coma. Towards the end of Prisoners of the Sun, Chiquito destroys the images and Falconer and the other expedition members awaken from the crystal ball coma.