Princess Mandie (voiced by Tara Strong) is Mark's ex-alien fiancée. Since her first appearance, she has attempted to marry or destroy Mark. She is described as very attractive by many characters, including Cosmo; but, because of Mark Chang's opposite alien opinions, he and much of his family repeatedly describe her as hideous. She claims her name is not pronounced "Mandy" but rather "Man-DIE." When she finally marries Mark she reveals that she only wanted to be queen of Yugopotamia and locks Mark up in a tower with Timmy. After their escape she chases them back to earth and is beaten by a jealous Vicky because Mark missed their date on account of being Mandie's prisoner.