Connie

Christmas can mean anything.... For Missy, it's solving murders in 1909. For a little girl in Dublin, it's Plasmavores knocking at the door. For Davros, it's a summons from the Doctor, who needs the mad inventor's help.

Deep below the surface of the planet Adamantine lies a crystalline wonder world of lava seas and volcanic islands, home to living rock-people. But when the Doctor and her friends arrive they find Adamantine under threat. The seas are shrinking, the magma is cooling, and mysterious, fatal Seething Pools are spreading fast. Something has come to Adamantine - but what does it want? Fearing an invasion is underway, the Doctor must lead an expedition to the surface of the world to save its molten heart....

The Doctor, Amy, and Rory are awe-struck by their first sight of Hope Eternal, a super-earth bigger than Earth itself with heavy gravity, volcanoes, and a crust loaded with mineral deposits. But their wonder is cut short when they discover a body dumped on the ground - a huge figure with extraordinarily long arms covered in thick, purple scales. Yet the corpse is not alien: he's human, albeit unlike any human Amy and Rory have ever seen.