This Australian cover is adapted from The Brave and the Bold (DC, 1955 series) #21 (December 1958-January 1959). It has been redrawn to create line art from the grey-tone original.
There is no "Adam Strage" series logo on this story.
This story was originally presented as an "Impossible -- But True" feature. It was rebranded for the reprint in Detective Comics 262.