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UFC 194 isn't going to be pretty.

Reigning featherweight champion Jose Aldo and interim featherweight champion Conor McGregor have both threatened to kill one another in the months leading up to this title fight, which finally will take place in December.

That seems to explain why McGregor was sparring with the man who, fictionally, is one of the best killers out there.

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For those unaware, that was Hafþór Júlíus Björnsson -- better known as Gregor "The Mountain" Clegane from HBO's "Game of Thrones" -- that McGregor was sparring with. In the fantasy world of "Game of Thrones," Clegane plays a terrifying enforcer-like giant. In real life, Björnsson is the five-time defending winner of Iceland's strongest man competition and a former silver medalist in the world competition. So basically the same thing.

A word of advice to McGregor, though: Don't get cocky with this one. Considering his resume, we actually think the better option is to run.

Valar Morghulis.