"This Mess We're In - Part One" is the 637th episode of Casualty and the 47th episode of the 22nd series.


Maggie's career hangs in the balance as the court case begins, with Marilyn forcing both Simon and Zoe to lie under oath - but Charlie spots a weakness in their case. Big Mac impresses Kelsey with a surprising skill, and Toby's mother visits the department with a journalist in tow.

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