This article covers a real-world subject which should not be taken as part of the Holby universe.
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"Little Sister" is the 1023rd episode of Casualty and the 19th episode of the 31st series. It was preceded by "Back to School" and followed by "Crazy Little Thing Called Love". The episode was directed by Fiona Walton and written by Jeff Povey and Joseph Wilde. Template:Series 31
