This article is not part of the Holby universe.
This article covers a subject that is part of the real world, and thus should not be taken as a part of the Holby universe.

"Mad as Hell" is the 960th episode of Holby City and the fifth episode of the 21st series. It was preceded by "A Daring Adventure or Nothing at All" and followed by "Force Majeure". The episode was directed by Daikin Marsh and written by Martin Jameson.

This episode marks the first appearance of cardiothoracic registrar Chloe Godard who is portrayed by Amy Lennox.

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