Sgt. Kirk #31 was published by Ivaldi Editore on March 1, 1973, as part of a series that began in 1967. Alberto Ongaro and Héctor Germán Oesterheld write, and art comes from Arturo Del Castillo, Hugo Pratt and Ray Collins. It features Zero Galván, Sgt. Kirk, Asso di Picche and Randall the Killer.