Patrick Ness has announced that episode seven of Class is called The Metaphysical Engine, Or What Quill Did. The BBC have revealed the following synopsis:
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.
The episode will be made available on Saturday 26th November. The time has been announced as 10am.