Notes:
Based on the motion picture by King Brothers released by MGM.
There is no month printed on the cover or in the indicia. This comic was based on the Gorgo movie, which per the indicia was released in 1960. An April newsstand date would equate to a June 1961 cover date.
On-sale date from Bestsellers (Newsdealer Magazine Inc., 1960 series) v15#8 (October 1960).