They’re fish. Flying fish.
“Fish that can swim in fog. I love new planets! “
(Friend of mine is having a pirate triple birthday party to suit a non-Whovian younger sibling… but she managed to squeeze in some Doctor Who anyhow!)
I shouldn’t be answering questions like this since I am a fan who hasn’t actually watched that much… mostly short clips on youtube. 0.o
But A Christmas Carol. In SPACE. With big flashy lighty things. And time travel. And fish.
(And I swear, when the Doctor got distracted with the fish while on the phone with Amy, I expected him to do a Gollum impression…)