Spiky was left alone in the house because Pinky have to attend a meeting. Spiky asked if he can go with Pinky because he is afraid to be alone, but it can't be possible since it is a meeting.
So what Spiky did was he watched some movies to forget the scary thoughts inside his head. While he was watching, the electricity when out in a quick second, then something appeared as we can see at the comic. Spiky was home alone, therefore there must only be one person inside the house. But base on what we can see, we are seeing two persons when the lights went out. It can't be Pinky since she went out for a meeting.
So who can it be?
MY DRAWINGS ARE ALL INSPIRED WITH BLACK AND WHITE THEME