Doctor Who "The Poison Sky"

That was fun.

Billie Piper was listed in the credits. Did I miss something? She wasn't in Part I.

Edited: Nevermind. Found it on the second watch. Apparently blinked the first time. Think Donna's going to remember?

Next episode is either going to be fantastic or horrendous. I'm not sure which I'd prefer. But did she have to be blond?