"Arrow's" Ra's al Ghul to Appear on "DC's Legends of Tomorrow"

According to ComicBook.com, Nable will appear in the ninth episode, but it's unclear under what circumstances.

The leader of the League of Assassins, Ra's operated behind the scenes throughout the second season of "Arrow" before stepping out of the shadows in Season 3. He seemingly died at the end of the season, but considering his history and access to the Lazarus Pit, it's impossible to declare Ra's al Ghul truly dead.

Premiering Jan. 21 on The CW, "DC's Legends of Tomorrow" stars Victor Garber, Brandon Routh, Arthur Darvill, Caity Lotz, Ciarra Renee, Franz Drameh, Dominic Purcell and Wentworth Miller.

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