Collectibles — including a “novelization” and comic-book adaptation — based on Reptilicus, a 1961 sci-fi movie about a ficticious prehistoric monster.
Charlton Comics’ Reptilicus book led to a “sequel” in the form of a second issue — after which, probably to avoid having to pay a licensing fee, the creature’s look (including color) was altered and the book’s title changed to Reptisaurus.