Class: The Metaphysical Engine, or What Quill Did

Doctor Who spin-off series. With the gang trapped in detention and out of the way, Miss Quill accepts Dorothea's astonishing offer - to help remove the Arn from her head and to reclaim her freedom. Alongside Ballon, an imprisoned shape-shifter, Miss Quill travels in a metaphysical engine and is taken to impossible, extraordinary and dangerous worlds, collecting materials in preparation for her life-changing procedure. After an emotional encounter with her surgeon and a nearly fatal operation, Miss Quill must find a way to return to Earth, transformed and ready for war.