Doctor Who: The Eleventh Doctor Year 1 #13 — Rob Williams

Two Emperors, and two halves of the Roman Empire, clash inside a freshly-exploded crater in 312AD – as the Doctor, Alice and Jones attempt to solve the mystery of the horror that rode down to Earth aboard the titanic meteor that caused it! Plus a surprise villain that threatens them all – one so secret there's no way we're mentioning them here!