Juan Santacruz began his career with the limited series 'Black Hacker' (three issues in 1997) and the one-shot 'Zeta' (1999). He did covers for superhero comics, and illustrated some 'Conan' stories for the the Spanish edition of 'Savage Sword of Conan'. He also did some science fiction stories, as well as erotic comics for Spanish magazines. He teamed up with the French writer Fred Brrémaud to create the sword & sorcery series 'Les Légions de Fer' at Soleil in 2002. Santacruz has also drawn for Marvel, such as 'Cable' #78, and 'Peter Parker: Spider-Man Annual 2001'. He has done various illustration jobs, and he developed the comic 'Nuclear Man' for the French publisher Sémic.