Rex is a model who competes to be on the billboard for Paddy's Pub. He is an early favorite's of Frank's but Frank ultimately decides he and two big breasted women will appear on the billboard itself. ("America's Next Top Paddy's Billboard Model Contest")
In "The Gang Saves the Day", he appears in heaven and is greeted by the recently deceased Mac during Mac's fantasy.
Rex appears as "The Master" of the cult in "Ass Kickers United: Mac and Charlie Join a Cult".
- Season Four: "America's Next Top Paddy's Billboard Model Contest"
- Season Six: "Dee Gives Birth"
- Season Nine: "The Gang Saves the Day"
- Season Ten: "Ass Kickers United: Mac and Charlie Join a Cult"
- Rex is a very soft and vulnerable person. Dee can force him to have sex with her by berating him using names like "cardio-jerk" or "workout turkey". ("Dee Gives Birth")
- In Mac's opinion, Rex is a "quality lay" (especially, for Dee).