This mini-comic appeared in what appears to be a very few action figures in the Remco line “Lost World of the Warlord”. Unconfirmed rumor has it that most were destroyed.
Per the indicia, the official title is “The Lost World of the Warlord” vol. 1 #1. I have a scan of the entire comic on my page (link here) and feel free to use the cover scan (I can supply a higher resolution scan if needed).