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.

"When Worlds Collide" is the 987th episode of Holby City and the 32nd episode of the 21st series. It was preceded by "Things My Mother Told Me" and followed by "Work-Life Balance". The episode was directed by Waris Islam and written by Andrew Rattenbury.

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