In 1954 Anglo created the character he is best known for, Marvelman. Since the mid-1940s L. Miller and Son had successfully reprinted American comic book company Fawcett Comics' Captain Marvel, Mary Marvel, and Captain Marvel Jr stories in the UK However, in 1953 Fawcett were party to a protracted lawsuit brought by National Comics (now DC Comics) claiming plagiarism of their Superman character. Fawcett cancelled their Captain Marvel titles, leaving Leonard Miller without reprint material for their best-selling British titles. Miller approached Mick Anglo to create an replacement; "One day Leonard Miller phoned and said he wanted to see me urgently. His supply of the American material for the Captain Marvel series had suddenly been cut off. Had I any ideas? ... So I quickly told him I had plenty of ideas, and for my trouble I received a regular supply of work for the next six years." Anglo replaced the Captain Marvel family with almost identical characters, Marvelman, Young Marvelman, and Kid Marvelman. In the six years between the relaunch of "Captain Marvel Adventures" as "Marvelman" from issue No. 25 (3 February 1954) and Anglo leaving L. Miller in 1960, he was responsible for scripting 736 issues of "Marvelman", "Marvelman Family" and "Young Marvelman" the "best-loved and best-known British superhero" and the longest-running British superhero. Gaining further mileage from the Marvelman material, in 1954 Anglo wrote one issue of "Captain Universe" for Arnold Books, a near-identical character to Captain Marvel and Marvelman.