In August, the middleweight division sent two of it's biggest stars to the light heavyweight division.
This move shook up the rankings big time, as Chael Sonnen and Vitor Belfort were members of the Top Five.
The divisional action didn't slow down for one second in September, as UFC Champion Anderson Silva agreed to a light heavyweight fight. We witnessed a potential title eliminator between Michael Bisping and Brian Stann, and a huge battle between Chris Weidman and Tim Boetsch was booked for December.
Let's take a look at how the rankings were affected by such a big month for the division. This is the official Bleacher Report MMA rankings of MMA's middleweight division for the month of October 2012.