Your First Look At Doctor Who's Next Big Guest Stars

io9

By Charlie Jane Anders

Who is David Tennant standing next to in this photo? The answer reveals a lot about the storyline of Tennant's final adventure as the time-traveling eccentric in Doctor Who, and its impact on the show's mythos. Major, huge spoilers below.

No, really. This is a massive spoiler. Are you sure you're down with that? Okay then.

Click here to see the spoiler.