This topic might have a better name.

Shouldn't this be closer to the credited role of Main gate prisoner?

Talk about it here.

A prisoner was an inmate of Stangmoor Prison. When Harry Mailer and the Master led a breakout, he kept guard over the main gate.

When Brigadier Lethbridge-Stewart (posing as a lorry driver) arrived at the prison to drop off some food, the prisoner allowed him to go in unaware that inside the Brigadier's van was a UNIT assault team. The prisoner was then knocked out by one of the UNIT soldiers. (TV: The Mind of Evil)

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