Originally built by Lord Ealdon in the 18th century and set up in Alistair Gordon Lethbridge-Stewart's time but abandoned soon after, Ealdon House was a UNIT research facility in Scotland.
As a child, Kate Stewart spent some time here with her father, where she briefly became friends with the caretaker's son Ben and the two of them would regularly run up and down the long gallery singing a nursery rhyme about a ghost that haunted the place called the Grey Man.
Noticing an irregularity in UNIT’s paperwork, Kate headed to Ealdon House. There she met Ben Donelly, the gardener, and his mother Alice. Kate’s memories of visiting the house soon returned to her and the unsettling nature of the long gallery. Entering there again she had another encounter with the supposed Grey Man and was nearly frightened out of her wits. After recovering, Kate was joined by Osgood and Josh and discovered that Alice had discovered a particular resonance in the house that induced fear in the humans. She had wanted to harness this resonance as a weapon before Kate’s father stopped her. With an unknown alien presence drawing near, responding to a message Alice left years ago and hearing of mass outbreaks of terror in the capital, Kate and Osgood deciphered and completed the message, obverting the crisis. (AUDIO: Invocation)