If you like Game of Thrones for... Ensemble cast, epic mythology, intricate politics and big action scenes, complex morality, engaging and layered characters, realism in a genre setting...
Then you might also like: Battlestar Galactica
Why: Those who aren't familiar with BSG might find this surprising, but SyFy's remake of a cheesy '70s space opera shares a lot of DNA with HBO's epic fantasy series. Expansive ensemble cast? Check. A more realistic take on an often unrealistic genre? Check. Moral ambiguity? Check. Strong and varied female characters in narratively powerful roles? Check times infinity.
Where GOT examines the interplay of power and moral corruption in a broken system, BSG asks: What happens when society falls apart? The plot revolves around the last remnants of humanity running from the rebellious robots who blew up their home planets, and the show constantly calls into question the viewer's commonly held morals. How deeply do you believe in democracy? When does survival of the whole trump the lives of a few? Is vigilante justice ever okay? It's not just one of the best genre shows ever, it's one of the best dramas, period.