After a tragic loss, the Doctor finds himself alone again. With this isolation, he chooses to understand his past and tries to unveil the mysteries of his previous self. No matter the cost.
The Doctor and Maggie are back. During their adventures they to go to the planet Varaton and to see the future of what could become of this planet. To then find Jim Henderson who hides a dark secret of what is born in Varaton, born in the darkness.