- "Never lose a race again! You're always winner."
- —Rex Viper Riiiiiiigs
Rex Viper Rigs, mostly known as Mr. Rigs is a character who appears in "Big Rigs: Over the Road Racing", "EarthBound", "Superman 64 Returns!!" and "Life of Black Tiger". Mr. Rigs is portrayed by series creator James Rolfe.
Mr. Rigs resembles the Nerd except that he wears a sideways orange cap, has a goatee, black tank top, sunglasses and tattoos that cover his left and right arms.
In the episode "Big Rigs: Over the Road Racing", he appears in a mock video game commercial meant to advertise the game properly. The commercial is stylized to resemble old video game commercials from the 80's and 90's.
Mr. Rigs makes a second appearance in the episode "EarthBound" as a character in the Nerd's subconscious. He appears along with a big rig with the infamous "You're winner !" screen on it and encourages the Nerd to beat EarthBound.
Mr. Rigs appears again in the episode "Superman 64 Returns!!" in a brief cameo where he does a short mock video game commercial for Superman 64 in the style of Big Rigs as both games feature boundary-breaking glitches.
Mr. Rigs is shown in the episode "Life of Black Tiger with Gilbert Gottfried", advertising Fred Fucks' game, Life of Black Tiger in the same style as his Big Rigs commercial. His real name is confirmed to be Rex Viper Rigs.
- Though the character's name was never mentioned in the "Big Rigs" appearance, James Rolfe refers to him as "Mr. Rigs" in the season commentary.
- The tattoos seen on Mr. Rigs' right arm are fakes done by Rolfe's wife, April, and the tattoos seen on Mr. Rigs' left arm are Rolfe's real tattoos which are a Judas Priest and dragon tattoo.
- His sunglasses changed from aviators in "Big Rigs" to sporty wraparounds in "Life of Black Tiger".