Lily appeared in the episode called 'The Curse of Clyde Langer'. Basically, Clyde got cursed by a totem pole in a museum, meaning that every time someone says his name, people turn against him. This happened with his mum and he had to leave home, hence the reason Clyde is living on the streets with Ellie (played by Lily). Hope that helped shed some light on what is going on here.<br/><br/>