Susan and Mary Test are twin sisters from the American-Canadian series Johnny Test. They are the main characters 13-year-old genius twin sisters who frequently use him as a lab rat for various inventions, most of which to impress their neighbor, Gil. Though they generally refuse to help Johnny in his antics, they generally end up doing so anyway due to Johnny blackmailing or manipulating them, or in exchange for Johnny allowing them to use him as a guinea pig. Their hard-headed demeanor makes them gullible, and they have been tricked by Johnny on various occasions. They have a habit of speaking in unison especially when reciting their catch-phrase "We're such geniuses."
Susan has navy blue eyes and wears a black skirt, knee-high socks and a pair of mary janes, and a light blue shirt depicting a star. She has straight red hair, held with a yellow star-shaped clip, and wears glasses. She tends to be more irritable than Mary is, which often leads to her downfall.
Mary has long curly red hair and teal eyes. She wears a light yellow shirt with a blue moon on it, baggy blue jeans, light olive green sneakers with the shape of an ivory-colored crescent moon, and a white lab coat. She wears a moon-shaped barrette in her hair. She and Susan both wear glasses. When she is seen without her glasses in Downhill Johnny, her eyes appear as green dots.
Johnny's Big Sister Smackdown (S04E18)Edit
Johnny finally convinces Susan and Mary to ask Gil on a date to see which girl he would rather go out with, unfortunately the girls can't get the nerve to speak to him. They use their machine to give themselves traits that will make them "guts." Susan uses Johnny's boy genes and Mary uses a lion's at first, which gives Susan a mullet and Mary big hair and a tail. They try to get more guts by adding gorrillas, crocodille, tigers, cavemen and sports players into the machine which makes them both into large angry muscular monsters that wrestle over Gil's love. Susan starts to look like a caveman and Mary grows red fur and a tail.