The celebrity first played tough-girl Heather Chandler on the TV Show in 2008 and this week returned in the dark, dangerous role.
And she got straight down to action - getting to fire high-powered guns as well as having a ferocious fight with her high school nemesis, series regular Sarah Lancaster.
But some of the scenes appeared to show that maybe Nicole did not do all her fight work - with one section seeming to clearly show someone else's face while she was supposedly fighting.
Also on the show was wrestling star Stone Cold Steve Austin who plays a cold-blooded villain who goes on the rampage after first attacking a warden with a rolled up newspaper.