Zbrigniev

Sergeant Zbrigniev (PROSE: Battlefield) or Zbregniev (PROSE: First Christmas) was a Polish soldier seconded to the United Kingdom branch of UNIT.

Zbrigniev began his service under Brigadier Alistair Gordon Lethbridge-Stewart and was still with UNIT years later, serving under Winifred Bambera. (TV: Battlefield) He never talked about the old "bug hunts". (PROSE: Battlefield)

When the Seventh Doctor arrived, Zbrigniev let him through on an outdated UNIT pass and later explained to Bambera that this was the same man as in the photo: he knew from past experience their scientific advisor changed appearance, though he was unaware how and didn't seem to have known him personally. (TV: Battlefield)

He was killed by Mordred when Mordred and Morgaine attempted to kidnap a nuclear missile. (PROSE: Battlefield)

Behind the scenes

 * Despite its spelling in the episode credits and novelisation, Zbrigniev's name was actually pronounced in the serial as "Zbigniew", a real Polish name, indicating a disconnect between auctorial intent and production reality.