Reed, who was originally attached to 20th Century Fox movie, long before it was handed over to director Josh Trank, said he was a huge Marvel fan but his version differed from the one Fox wanted to make, reported Digital Spy.
"I was a huge Marvel fan when I was a kid and knew 'Fantastic Four' inside out... So I went in and got (hired for) the movie... I developed it for the better part of a year with three different sets of writers.
Reed, who recently directed the superhero film "Ant-Man", added that such an "environment" is very different to the way that Fox and Marvel Studios work today.
"Fox at that time had a very specific idea... They wanted to pitch it much younger than I wanted to and I always felt like they were treating those characters like b-level characters.
The director said he is "psyched" about Trank's version of "Fantastic Four" which will open in cinemas in the US on August 7.