"There was a pure rage-driven aggressive side coupled with almost a childlike, simple understanding of that world and (Grimlock's) place in it," Berger said. "There is something about dinosaurs, and power, and the Transformers' lore and story-driven characters. I have very loyal fans and fan base, and I try to be equally loyal to them."
Grimlock is noble, with sense of purpose that crosses generations, Berger said . He recently met a group of fifth-grade students who said they discovered the original cartoon series and told him how much they loved Grimlock.
Tieger said they are trying to tap into those fan feelings with the new origin story and new look. But he wants Grimlock to be Grimlock.
"(Grimlock) is a good guy through and through, so he's an Autobot," he said. "But he does not always agree with Optimus Prime.
"There's some interesting conflict that happens between the two of them, story-wise. It's great to see Optimus from a different perspective."
While fans pushed hard for the Dinobots inclusion in the Transformers movies, it never happened; Tieger said they will be very happy to get to play as Grimlock.
"Where the game starts is just going to blow you away and fulfill fantasies you've had from 20 years ago."