Cover titled had some additions during the run. The indicia did not reflect these. Oddly the indicia from issue 7 - 58 say Countdown and Rocket. This is not recorded elsewhere and seems to be ignored by fans and collectors and would probably not be recognized as the title if used.
TITLE CHANGES
* 1-18 Countdown
* 19-45 Countdown The Space-age comic!
* 46-56 Countdown for TV Action!
* 57-58 TV Action in Countdown