Before writing, there was research
Before starting the script for Eternals, writers Ryan and Kaz Firpo were given research materials by Marvel. 800 pages of research materials to be exact, which included basically everything every written with the Eternals in it. It took them 4-5 weeks to pour over it all and despite the more recent Neil Gaiman run of Eternals being more popular, their story drew most of its inspiration from the original Jack Kirby comics.
