Tom Tataranowicz admitted he had not really cared much for the "robin's egg blue" costumes of the first season. He felt that they lacked a certain "cool factor quotient" which he felt that superheroes should posses. He didn't want to get too retro when revamping the costumes, so pretty quickly he zeroed in on the dark blue costumes that John Byrne had drawn for the Fantastic Four in during the 1980s.
In the comics, for years Sue Richards was known as Invisible Girl. They modeled the Fantastic Four after the more recent comics, where she had changed her name to the Invisible Woman.
For the season two opening sequence, Tom Tataranowicz wanted to cover the scope of the history of the Fantastic Four by not only showing their origins, but also featuring several classic Fantastic Four comic book covers brought to "life". The Series Composer, William Anderson, did a theme, and Tataranowicz drove around for several hours in his car listening to it over and over. He admitted that is one way that he likes to work on conceptual things, especially main titles, just letting images come to mind that the music inspires. Tataranowicz then wrote up a beat script, and Dick Sebast did the storyboard.
The vast majority of episodes in season one, consisted of fairly accurate re-tellings and re-interpretations of classic 1960s Fantastic Four comic book stories by Stan Lee and Jack Kirby. The season two episodes also drew upon John Byrne's 1980s run on the Fantastic Four comic, in addition to further Lee and Kirby adventures.
Tom Tataranowicz said in an online interview, the crew did not have any idea if there would be a third season. But, after seeing how the new season was not being promoted as different, and kinda felt like it was just being "dumped" out there, the handwriting seemed to be on the wall. The crew quickly moved on to developing The Incredible Hulk (1996).