Big XBig X.

Big X (ビッグX, Biggu Ekkusu) is a science fiction manga series and an anime series by Osamu Tezuka, about German Nazis trying to create secret weapons toward the end of World War II. The anime, which was Tokyo Movie's first work, is considered lost, with only episodes 1, 11 to 12, 14, and 40-59 known to survive.