Mary's Ex-Boyfriend is a snail who just appears in the episode Gary in Love. As his name says, he used to me Mary's Boyfriend. He is very dangerous because he threatens Gary alot. He also has his own gang, with also very dangerous snails. At the end of the episode he apologizes to Gary about being mean to him and invites him to dinner.
Mary's Ex-Boyfriend has a purple shell with a blue line going in circles and blue dots. He has an olive colour skin and wears a brown hat.