Los desafíos presents three separate stories that are linked by an American presence in Spain in the 1960s, with Dean Selmier playing the role of the American male in all three.

• Elías Querejeta PC
• Dean Selmier
• Francisco Rabal
• Daisy Granados
• Asunción Balaguer
• Teresa Rabal
• Alfredo Mayo
• Julia Gutiérrez Caba
• Barbara Deist