Kevin Murphy portrayed Tom Servo on Mystery Science Theater 3000 for 10 years, has written bestselling books on films, and contributes to NPR as a movie commentator. Now as a member of Rifftrax, he's doing a live show in August, a comedy show built around the 1983 special episode of Doctor Who, "The Five Doctors." We chat about riffing, respect for Doctor Who, and being known as Tom Servo.