It looks like Justice League made Thanos comic book creator Jim Starlin worried about Avengers: Infinity War.
Speaking in an interview with Cinema Blend, the comic book writer Jim Starlin remembered a time when Avengers: Infinity War co-director called him up so that they could discuss how his creative theme would execute Thanos’ backstory in the Russo Brothers’ two-part Avengers movie. Sure, the past ten years of the Marvel Cinematic Universe may have been building up to this confrontation with Thanos, but Infinity War didn’t seem like it was long enough for the film’s writing team to give an in-depth background on the Mad Titan. The Russos needed to come up with an efficient way of telling Thanos’ backstory.
During their call, Starlin remembered how Justice League tried to establish Steppenwolf, and the comic book writer immediately became worried for Infinity War.
"[Co-director] Joe Russo called me up like about a month before Infinity War came out and said, ‘Well, we gotta talk about all that stuff, how there was a Thanos backstory, because the movie was gonna be two and a half hours long, and they only want two hours on this one,’” Starlin explained during the interview. “I had made the mistake of watching the Justice League movie about a week before. When he told me this, I started thinking, ‘It’s going to be just like the Justice League [movie], where Thanos comes in...’ and I’m going, oh my goodness.”
Of course, Starlin ended worrying for nothing. The Russos were successfully able to balance out everything in their two-part Avengers movie, from Thanos introduction, Thanos backstory, to properly dividing scenes for all the different heroes in the Marvel Cinematic Universe.
Avengers: Endgame is currently available on Digital HD, Blu-Ray, and DVD.