Cosmo Cosma and Wanda Fairywinkle Cosma are the fairy parents who are assigned to Timmy Turner. They are considered to replace Timmy's irresponsible and uneducated biological parents. To keep themselves a secret, they usually masquerade as Timmy's pet goldfish and live in a magical castle inside of his fish bowl. It is believed that Wanda's name was derived from the 1988 movie A Fish Called Wanda^{[citation needed]}. Her full name is revealed in "77 Secrets of the Fairly OddParents Revealed". Timmy is forbidden from revealing their existence, the penalty being to lose them for good, though there are several loopholes to this rule. In the beginning of Season 6, they had the first fairy baby in over 10,000 years, whom Timmy names Poof. It is also revealed in "This Is Your Wish" that Cosmo is directly responsible for many historical tragedies, such as the volcanic eruption which destroyed the city of Pompeii, Italy and the sinking of Atlantis. He also destroyed Pluto in "Vicky Loses Her Icky". Wanda is responsible for the extinction of the dinosaurs. Throughout their careers as fairy godparents, they have been assigned to many famous icons, such as Tina Turner and Bill Gates. Before Poof was born, Cosmo was the youngest fairy in existence. Initially, they were charming and kind, but with the adoption of a more satirical humor to the series, this slowly, but steadily deteriorates, to point of Wanda being characterized from the voice of reason to simply annoying and nagging, while Cosmo changed from simply naive and energetic to a cynical and childish male.