"Heroes and Villains" is the 523rd episode of Casualty and the 29th episode of the 20th series.
Synopsis
A panic-stricken Kelsey allows a patient to discharge herself, fearing she will spill the beans about their shared past. However, Luke becomes privy to her secret when the woman's condition is discovered to be life-threatening. Sam struggles to cope with the demands of the first day in his new job.
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