Shelby Martinez is the love interest to Henry "Mutt" Jones III in Mutt Williams and the Fertility Temple and is portrayed by Lizzy Caplan.

Shelby's father had owned a casino in Las Vegas and she escaped with Mutt and Milo on a plane to Florida from gangsters who were after her family's money. She is likely a damsel in distress when she is in peril. She thinks of seducing Mutt while Milo is over-protective for him. She has great fighting skills when she punches Noriko Watanabe. In the climax, she and Mutt become attracted to each other.

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