Mary the Snail is a sea snail who first appears in the episode "Gary in Love." She also appears in the online game Gary's Crush.
Mary is an elegant and posh snail. Her owner is Monica. She looks very much like Mrs. Puff's snail and Snellie. She is a light blue snail with pink lips, dark blue irises, and eyelashes. Her shell is lavender, with a dark purple swirl. She has a bow that is red with white polka dots on the top of her shell.
Role in episode
While at the Snail Park, Gary sees an attractive female snail on whom he develops a crush, who just so happens to be Mary. She likes him for a short time, however, her current love interest is Brad's snail, Billy (who says "meow" in a human's tone of voice).