PHOTOS: David Tennant & Billie Piper Doctor Who Promo Shoot #ThrowbackThursday

To celebrate David Tennant and Billie Piper's appearance at the Wizard World Comic Con in Philadelphia this weekend, today's Throwback Thursday post is a collection of promotion photos from 2006. The photos were used to promote the second series of Doctor Who, which starred David as the Doctor and Billie as his companion Rose Tyler.