False Negative (audio story)

 was the fourth story in the Encounters audio anthology.

Publisher's summary
When a strange travel capsule is activated in UNIT's laboratory, Osgood and Josh find themselves in a whole new world of trouble. Soon, nobody at UNIT HQ is quite who they seem, and the team discovers that the greatest danger they could ever face comes from within...

Plot
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Cast
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Continuity
to be added