Skorpio #21 was published by Ediciones Record on June 1, 1976, as part of a series that began in 1974. Héctor Germán Oesterheld and Hugo Pratt write, and art comes from Arturo Del Castillo, Horacio Lalia and Juan Zanotto. It features Zero Galván, Nekrodamus, Hor El Temerario, Yor and Loco Sexton.