After three seasons of showing what it might be like it a young Bruce Wayne had to deal with super-villains as a much, much younger, pre-Batman version of himself, it looks like things aren’t going to be getting any easier in the fourth season of Fox’s ‘Gotham.’

Veteran genre actor Alexander Siddig, who viewers will recognize from his stints on ‘Star Trek: Deep Space Nine’ and ‘Game of Thrones,’ is joining the show full-time as the classic Batman comic-book character Ra’s al Ghul, who will serve as a manipulative force in molding the young Wayne into the vigilante audiences know and (mostly) love as the Batman.

Says Sidding, in a recent interview:

“My character has been on a centuries long mission to locate Bruce and finally finds him, and will do anything he can to get his hands on him, to manipulate him into what [Ra’s] wants him to be. That is going to be Bruce’s biggest challenge. Just how dark will he go? How far is he prepared to follow Ra’s al Guhl? [Season 4 is] a season so far of extremes.”

Batman big-screen viewers are no stranger to Ra’s al Ghul, as he was utilized effectively in Christopher Nolan’s ‘Dark Knight Trilogy’ of films, portrayed on-screen by everyone’s favorite “I Will Find You” fella, Liam Neeson.

As the city sinks deeper into chaos, GOTHAM will continue to follow the evolving stories of the city’s most malevolent villains: THE PENGUIN (Robin Lord Taylor); EDWARD NYGMA/the future RIDDLER (Cory Michael Smith); SELINA KYLE/the future CATWOMAN (Camren Bicondova); BARBARA KEAN (Erin Richards), TABITHA GALAVAN/TIGRESS (Jessica Lucas) and BUTCH GILZEAN (Drew Powell). The series also will catch up with the future POISON IVY (Maggie Geha), who, after an encounter with a monster from Indian Hill, finds herself reborn as a young woman who’s harnessed the full power of her charms; and will dive into the origin stories of JERVIS TETCH/MAD HATTER (Benedict Samuel), a talented hypnotist teetering on the edge of madness; and the TWEED BROTHERS.

‘Gotham’ moves to Thursday nights as it returns with new episodes on Fox on September 21, 2017.