Gertie is a one episode character from the Australian/New Zealand series Staines Down Drains. She's a creature made out of yogurt that says shes low-fat and presents herself as a fitness instructor. She appears muscular and flexes in the episode but in the end she reveals that she's actually not made of low-fat yogurt and was using her shape-shifting ability to look fit so people would like her. She helps save the day in the end with her strength and says that even though she is fat she's still fit.

Fighting Fit (S01E12)Edit