As the second of the Blasco brothers, Alejandro Blasco also chose the comics profession. He started out drawing an innocent humorous character called 'Morronguito' for the girls magazine Mis Chicas in the early 1940s. Since 1944 he turned out a series of stories for Chicos, such as 'Dardo Amarillo', 'Por Tierras de Emoción', 'Policía Montada', 'El Ídolo del Lago', and 'Corsario X'. He created 'Gangsters' and 'Una Evasión Difícil' for El Coyote magazine. He also cooperated on Alcotán magazine. He also worked on British comics like 'Billy the Kid' for Sun and 'Buffalo Bill' for The Comet in the 1950s.
He formed a studio with his brothers Jesús and Adriano, creating several comics throughout the 1960s and 1970s ('Steel Claw', 'Los Guerilleros'). He remained active in the comics field until the late 1980s.