The company's senior vice-president of media relations John Solberg confirmed via Twitter that Legion star Charles. S Dutton has been cast in the key role of Captain Cross.
Cross serves as boss to the series's two lead characters, homicide detectives Christian Walker and Deena Pilgrim, who are tasked with investigating superhero-related crimes.
Although Dutton is the only confirmed cast member so far, Friday Night Lights star Kyle Chandler has long been rumoured for the role of Detective Walker.
In addition, Battlestar Galactica regular Katee Sackhoff recently confirmed that she has been in talks for a leading role in the series, which may or may not be that of Walker's partner Deena.
The adaptation is being penned by The Walking Dead scribe Charles Eglee, while the pilot episode will be helmed by Law & Order director Michael Dinner.