The Dark Knight star landed the lead role in a film adaptation of the graphic novel earlier this month. He spoke about the project with Collider, revealing that the character will not be "dumbed down" for this version.
"Frankenstein is an intelligent, evolved man, and that's how he is portrayed in this movie, for sure," Eckhart said. "In the book, he's very evolved. Somewhere in time, Frankenstein got dumbed down. He is a beast, but somewhere he lost his heart."
He continued: "I don't know how much heart we'll be able to get into it. It's not a docu-drama of Frankenstein. It's not an insightful look into his soul. It's more of an action movie, really. But, it will be cool."
The actor recently signed on to play Beach Boys drummer Dennis Wilson in a forthcoming biopic following the last six years of Wilson's life.
Eckhart can currently be seen in The Rum Diary opposite Johnny Depp.
I, Frankenstein will begin filming in January 2012, ready for release on February 22, 2013.
Watch Aaron Eckhart in the trailer for The Rum Diary below: