Chalmers was a UNIT soldier who served under Brigadier Lethbridge-Stewart.

He was part of the UNIT convoy sent to Devil's End and was stationed to guard the dig at the Devil's Hump. He later reported to Captain Yates when the dig exploded, the result of Azal's spaceship self-destructing. He then reported that the heat barrier around the village had disappeared. (TV: The Dæmons)

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