In the late 1990s, after he had fallen ill, Ishinomori contacted manga artist Kazuhiko Shimamoto to do a remake (ambiguously a continuation) of his original one-shot manga. This remake boasted an extensive, continuing storyline and more complex artwork (along with a tribute to Ishinomori in the final issue, with several of his famous characters gathered together). This was the manga that was presented in the US by Tokyopop. The original 1970 version was digitally released in English by Ishimori Productions in 2012.