Ronda Rousey absolutely DESTROYED her real-life husband Travis Browne in an underground fight club on Monday ... and it was all for an episode her show "9-1-1."
Ronda is a regular cast member on the FOX hit -- and this week, Ronda's character Lena brought her firefighter co-worker Eddie (played by Ryan Guzman) to a parking lot fight club to work out his anger issues.
But Ronda wasn't a spectator, she was there to fight -- and her opponent is a giant, bearded tattooed man .