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The girls' powers are as follows: Cleo can manipulate water, Emma can freeze water, and Rikki can boil water. In season 2, they gained weather control: Cleo can manipulate wind, Emma can draw moisture from the air to freeze, and Rikki can draw forth lightning which catches things on fire. Bella, the mermaid introduced in season 3, can crystallize and gelatinize water.
The actresses put full-cream milk in their eyes to help them keep their eyes open underwater.
Phoebe Tonkin (Cleo Sertori) and Claire Holt (Emma Gilbert) both went on to appear in The Vampire Diaries (2009) and its spin-off The Originals (2013) with the latter also appearing in Legacies
The theme song at the beginning of each episode is sung by a different singer each season. Season 1 was Ellie Henderson, season 2 was Kate Alexa, and season 3 was Indiana Evans who also portrayed Isabella Hartley.
Only two seasons with a total of 52 episodes were originally planned but, due to popular demand, a third and final season was filmed. Season one premiered in July 2006, followed by season two in September 2007. Season three first aired in the United Kingdom in October 2009, with the Australian premiere occurring in May 2010.
Every season starts with a full moon.