Doctor Who: The Eleventh Doctor Archives — Titan Comics
Issue: #33
The nature of the 'sky world' has been revealed! But the mystery of how it cam into being still eludes the Doctor. But with Clara and the crew of a retrofitted B-29 bomber from World War II in tow, the Doctor sets out for the center of this strange dimension with seemingly infinite skies!
Creators: Shawn Lee, Denton J. Tipton, Andy Diggle, Charlie Kirchoff, Eddie Robson, Andy Kuhn
Characters: The Doctor, Clara Oswald