Originally Posted by Vainamoinen
Girl in the Fireplace.
This was actually my introduction episode and honestly I'd recommend it over Blink. First of all because I'm that weird fan that honestly didn't like Blink as much as everyone else did, but also because Blink is one of those tonal exception episodes. Now, those are important bits of punctuation that define what Who is as a show, but like all punctuation it doesn't really do much without a context-setting sentence.