Turns out that year or so of learning out to type the name Ra's al Ghul (the a in al is always small) is not going to go to waster since the character is now longer an Arrow. Deadline is reporting that Alexander Siddig, who has appeared in so many genre shows it may be harder to find ones he hasn't been on, will be bringing his talent to the Fox series Gotham. The Demon Head is expected to make his debut on the Batman prequel series shortly after it's return from a winter hiatus. The head of the League of Shadows will appear in relation to Bruce Wayne's continued search into the Court of Owls.
Ra's al Ghul, a creation of Julius Schwartz, Denny O'Neill and Neal Adams in 1971, has been very popular in the last decade or so having appeared in Christopher Nolan's Batman Begins as played by Liam Neeson and then being the big bad for Arrow season 3 and popping up on DC's Legends of Tomorrow as played by Matt Nable.
Siddig is probably most recognized for his time as Dr. Julian Bashir on Star Trek: Deep Space Nine, but he has also appeared in other series like 24, Merlin, Primeval, Atlantis, Da Vinci's Demons, Game of Thrones, Peaky Blinders and even popped up on Family Guy.