Soldier Serum and develops an enhanced physique, after which  he becomes Captain America. The good Captain is the second hero, and  the first American character, to possess such an enhanced physique  (the first hero being Ilya Muromets, the Russian equivalent to King  Arthur). This backstory was rejected by Republic during the making  of this serial, as it would have required costly retakes at the  time. In the serial, Captain Americas real name is Grant Gardner,  he is the citys district attorney, and his foe is the Scarab, aka  Karl Maaldor, played by Lionel Atwill (qv) 