Chris Unger/Getty Images
A lightning left hand made Conor McGregor a champion. But it was his persona that drew the world's attention.
Other UFC fighters have attempted to cross over. But progress in that direction has been incremental, from Tank Abbott's appearance on Friends to Ken Shamrock and Ronda Rousey invading the world of the WWE to Randy Couture's various B-movie adventures.
None of them have managed to reach McGregor's level in terms of star power.
Chuck Liddell appeared in commercials. McGregor makes them for his own brand of Irish whiskey.