Doctor Who's Jenna-Louise Coleman on Clara's Meeting with River Song

Finally, we'll uncover the mystery of the Impossible Girl.

On Saturday's finale of Doctor Who (8/7c, BBC America), Clara (Jenna-Louise Coleman) is called into action when the creepy Whisper Men kidnap Victorian pals Vastra, Jenny and Strax (Neve McIntosh, Catrin Stewart, Dan Starkey). In order to save his friends, the Doctor (Matt Smith) must venture towards the one place that no Timelord should go because it could undo everything in his past, present and future. What's at stake affects more than just him, and the key is held in the episode's title, "The Name of the Doctor."

Doctor Who's Coleman on Clara's relationship with the TARDIS

But the Doctor isn't the only one we'll learn more about. As promised, the season finale will finally explain everything about Clara: How she is Soufflé Girl, how she's twice dead, how she's lived in different times without knowing it.

We'll also see Clara meet another significant female in the Doctor's life: his wife, River Song (Alex Kingston). How is this even possible? You'll have to watch to find out, but Coleman tells TVGuide.com, "I think people are going to assume our relationship to be a certain way, but [showrunner Steven Moffat] has been very clever in bringing her in. It was great to see Clara react to another woman in the Doctor's life because she didn't know he was married until this point. She's only just found out. So that is a whole interesting part of the story as well."

Check out this preview of Doctor Who's "The Name of the Doctor," which airs Saturday at 8/7c on BBC America:

What are your theories on Clara?