Dexter had woken up early as an automatic response to being woke up early day after day and took a shower when he realized that he had no work to go to. He heard the cat flap go. Its not like the two didn't like animals but they couldn't afford to have them so had nailed it shut. "Dad? Didn't you nail the cat flap?"
"Course I did." Harold said in his room getting ready for work.
"Well..." Dexter said picking up a nail from the floor and looked at the cat flap as the startling blue eyes of the Doctor met his startled grey ones. He opened the door surprised. "What are you doing here?" He asked confused.