The "Legends of Tomorrow" cast just keeps on getting deeper as this time, the villain side is getting a familiar face in Matt Nable, who played Ra's Al Ghul in "Arrow."

According to Comic Book, Warner Bros. and The CW confirmed his addition to the cast and he will join Damien Dahrk and Vandal Savage as the main villains. It is unknown if this will be the Ra's Al Ghul from the past or the one Oliver Queen killed who actually managed to survive.

Now, fans might be wondering if these villains will keep on appearing on the cross-over, will it be the same for the Legends? Apparently not according to executive producer Greg Berlanti. According to the EP, the main purpose of the show is to give the other Legends more screen time, which means they will seldomly appear in the other two series from hereon out.

"In fact, once Legends is born in January, there's really no intersection on the other shows. Legends is kind of its own wacky, crazy kind of thing that allows for some fun surprises in terms of who may visit and how because they're flying through the timeline and you'll start to see more of that. But not on Arrow or Flash," he told IGN.

The show will make its debut on Jan. 21 and the All-Star ensemble includes Brandon Routh as The Atom, Caity Lotz as White Canary, Victor Garber and Franz Drameh as Firestorm, Ciara Renee as Hawk-Girl, Falk Hentschel as Hawk-Man, Wentworth Miller as Captain Cold and Dominic Purcell as Heatwave. Grant Gustin and Stephen Amell will occasionally make appearances as The Flash and Green Arrow, respectively.