Episode 4 of Series 2 (titled Chase the Sun). In this episode, when Penelope gets a bad exam result she wishes for the school to be destroyed, not realizing her mother has gone there to attend a meeting. In the confusion, the "Master from the Past" appears, and Penelope realizes that they have a race on their hands if they are to reverse the wish without changing the past - and the future...
Stars Alexandra Milman, Anna Galvin, Glenn Meldrum, Sandy Winton, Mark Mitchell, Fletcher Humphrys, Monica Monaghan and Kirkland Fisher.
