SHAYA: Doctor, you said you'd been here before. When was that?

DOCTOR: A different life. Back when the world was made of diamonds. And I met something so vile. It had no face, no name, no self. I have never been so scared in my life.

BELINDA: What did it do?

DOCTOR: It had fun. Oh. Huh. It played games. I think it was learning.

MR RING-A-DING: Don't make me laugh! Because... (sings) I'm Mr Ring-a-Ding. I'll make your heart bells sing. Please don't make me laugh. Just take my autograph. Now don't be crazy, pretty lady, I know just one thing. For I am he! Oh, yes! I'm Mr Ring-a-Ding! Did you ever meet a Ring-a-Ding? Did you ever see such a lovely thing? Now jump and hop and laugh and sing for I am he! Oh, yes! I'm Mr Ring-a-Ding! Oh, my!

SARAH JANE: I saw amazing things, out there in space. But there's strangeness to be found wherever you turn. Life on Earth can be an adventure, too. You just need to know where to look.