Jesús Blasco is considered one of the most significant artists in Spanish comics. He created Cuto for Boliche magazine and produced several science fiction and adventure titles. In the 1960s he joined the British publishing agency Fleetway and worked on Steel Claw, Billy the Kid and Buffalo Bill amongst others. For 2000 AD he provided the art for several episodes of Invasion! London born Ken Bulmer was a prolific writer who made his mark in a number of genres and mediums. By the end of his career he had over 160 novels published alone. Writing for American science fiction magazines like Amazing Stories whilst in his teens, he contributed to the small British fan magazines of the 1940s, and had his work published alongside such luminaries as John Wyndham and Arthur C. Clarke. In the 1950s he worked for a small number of UK SF novel publishers and started to get some recognition which eventually led to him selling stories directly to Ace Books in New York.

It was in the same decade that he started to submit scripts to Amalgamated Press and began his comics career. He wrote several of the War Picture Library stories as well as several serials for Lion and Valiant, including the famous Steel Claw for the latter.