Two trespassers were halted in their tracks at the Inverness Castle site which is being transformed into a major cultural attraction.
The reality show, which has pulled in 10 million viewers a night, is filmed at Ardross Castle, about 30 minutes north of Iverness in the Scottish Highlands.
The Traitors is the BBC's crown jewel, with 10m faithful viewers having tuned in to watch its first episode of series three.