SmallerOnTheOutside has proposed a name change to Old man sleeper. And that's fine according to our stylistic preference for sentence case. However, the concern for all cast listings involving the K9 series is that we don't actually know the source of the name — cause there is no traditional cast list in the end credits as televised. This move on hold until someone can provide evidence for the source of the character name.
Talk about it here.
The old man, along with the rest of London, was sent to sleep by the Bodach. He later became part of the Bodach's sleeping army which assaulted Gryffen Manor. The Bodach were soon defeated by K9, causing the Old Man, along with the rest of the army, to be freed from its control. (TV: Dream-Eaters)