*Mary WrestleMania Spuckler is one of Cletus's many children. She is forced to marry Bart in order to save Lou. Bart and Mary end up not getting married but develop a genuine attraction which leads to an on-and-off romance. Their relationship has been explored in three episodes, making her the most prominent of Bart's love interests and Bart's first serious relationship.

She seems to be the most intelligent of Cletus's children, speaking in correct English (in contrast to the rest of her family) and showing a strong talent for music and performing.

Unique among Simpsons background characters, Mary's appearance changes in each episode she appears in. Over time she seems to get a bit older, which is rather odd for the typical non-aging Simpsons.

In her debut in "Apocalypse Cow", Mary is depicted with freckles, blue overalls, and pale brown pigtails. However, in her return for "Moonshine River" four years later, Mary's physical depiction has noticeably matured; she has grown slightly taller and acquired a more mature figure, and her eyes have taken on a more attractive ovular shape as opposed to the larger, rounder shape in which they had been set in Mary's debut. Her eyebrows also have thickened, and her pale brown hair has darkened to pale orange. She has kept her freckles; however, she now has pink lips. During this episode, she changes clothing to a black sleeveless dress with a tall black hat to a grey sweater, blue jeans, and red handkerchief in her hair. In "Love is a Many-Splintered Thing", Her appearance is a mixture of her other appearances as she has the same face and body appearance from "Moonshine River", but she loses her pink lips and retains her pigtails from "Apocalypse Cow". She is depicted as wearing a frilly blue dress that has a flower on it with red and white sneakers and knee-high socks. Her guitar appeared on the song called "We Bring it All Together" by The Superfriends.

Unlike most of the Spuckler children, Mary appears to have at least an average education, as she's a prominent member of the 4-H club and is able to use proper English. She is a kind-hearted, calm person. Unlike her family, Mary enjoys things such as the arts, takes care of her appearance and dresses nicely yet she also loves her country life and eventually went back home after running away to New York and other cities and is now living happily as a farm girl once again.

She is probably one of the middle children, as she looks older than her brothers but younger than Whitney. She is probably around Jitney's age.

Mary's former middle name is "WrestleMania," named after the WWF flagship event (now WWE's) Mary was born in a gas station. Mary got 1580 on her DQAT (800 ice cream, 780 Brazier) Mary is one of the few Spuckler children who goes to Springfield Elementary School, another being her younger sister Crystal Meth Spuckler as seen in "Pay Pal". Mary apparently got to drink milk as a kid instead of paint according to Bart. In the episode "Yokel Chords", Cletus explained to Lisa that the children present were the only kids in the family, however Mary does not appear. She is one of the few characters in the series who has aged or at least looks older. Mary appeared in a The Simpsons: Tapped Out 2017 event. In "Apocalypse Cow", she's 11, but on later episodes, she's 13. She is one of the few characters with eyebrows.*