CNBC's documentary "Ultimate Fighting: From Blood Sport to Big Time" premiered last Thursday at 10pmET, and was the highest rated first airing of a documentary ever on CNBC in the A25-54 demo. It was the highest premiere in total households since the July documentary "Big Mac: Inside the McDonald's Empire."

The 10pmET original broadcast rated at 221,000 in the A25-54 demo and 320,000 for total households. The documentary also scored well in its repeat at 1amET, with 120,000 in demo and 147,000 in households.

"Ultimate Fighting," hosted by Scott Wapner, will re-air tonight at 9pmET and MidnightET.