Sgt. Rock is one of the most unstoppable American soldiers of WWII, where he fights countless heroic battles with his squad of men named Easy Company.
When an extremely powerful bomb is placed in an award that is given to Superman, its explosion sends Superman at speed faster than light into the past era of World War II. Due to the incredible shock from the blast, Superman suffers from amnesia, and later meets Sgt. Rock and Easy Company. The soldiers dub Superman Tag-Along and he helps them fight off the Nazi threat. Finally regaining his memory, Superman uses his super-powers to time-travel back to the year 1979 (DCCP No. 10, Jun 1979: "The Miracle Man of Easy Company!").