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 Strange" series logo on this story. See notes at original printing for the creative credits listed.
This story was originally presented as an "Impossible -- But True" feature. It was rebranded for the reprint in Detective Comics 262.