“Your Face or Mine?” is episode ten of season three of Eureka.
Carter has his job back as sheriff as, in the previous episode, “Welcome Back, Carter”, the robot Sheriff Andy had decided he personally wasn’t suited to the job (given that he kept being hit by falling objects, possibly not a surprise) and told Henry that the town’s sheriff couldn’t be fired without the mayor’s approval – Henry, in other words. Which means that Carter couldn’t be fired without Henry’s approval.
Carter is now in for his annual physical, which is a bit different to most. During this period, Jo will be taking over as sheriff. After an accident involving a new DNA security apparatus, Jo starts behaving strangely. She does things, then cannot remember having done them, and thinks that people are pulling a practical joke. Is she suffering from memory loss and multiple personalities? Or is something completely different going on?