What it says on the tin. (Including Follow-ups to: Maybe one of these days you can let the light in, and One Of Those Things, and Mrs and Mr Pond..)

If someone had told Darcy Lewis she was going to have to spend an entire week babysitting an assassin, she would have laughed in their face at the sheer unbelievableness of it. But the thing was, that wasn’t even close to being the most unbelievable thing about the week. (Set post-Age of Ultron)