"It's alive!"
"What is it?"
"It's nothing. It's tiny. One of those insignificant little power cells that no one ever bothers about, and it's clinging onto life, with one little ounce of reality tucked away inside."
"Enough to get us home?"
"Not yet. I need to charge it up."
They're made of plastic. Living plastic creatures. They're being controlled by a relay device in the roof, which would be a great big problem if I didn't have this. So, I'm going to go up there and blow them up, and I might well die in the process, but don't worry about me. No, you go home. Go on. Go and have your lovely beans on toast.
The Doctor on the verge of tears: *long dramatic speech about how Donna changed his life, saved him, made him a better man, rewrote his DNA, rewired his brain chemistry, imprinted on both of his hearts, and how her absence will break his hearts and leave him in darkness and nothing is the same without her*