Face Off is one of my favorite TV game shows.  Have you watched it?
Yes. I have seen it before
I love watching how the make up artists use prosthetics to create the horror film style faces
It's really cool! They have great imaginations! 
The host, McKenzie Westmore, used to be on the soap opera "Passions
I didn't know that. Have any of the other participants in the show been on previous programs?
I don't know about the contestants, but Kevin Smith, Greg Nicotero, Rick Baker, and Doug Jones have served as guest judges
What kind of criteria do they use to judge the contestants?