
Ever since we met companion Ruby Sunday (Millie Gibson) in Christmas Day episode "The Church on Ruby Road," there's been a big question at the heart of "Doctor Who:" who was the mysterious figure who abandoned the newborn Ruby on Christmas Eve 20 years earlier?
Luckily, season finale "Empire of Death" supplies plenty of answers, as it turns out the mystery is big enough to pique the interest of a god with the power to wipe out life as we know it.