S13, E7: Lost in the universe of antimatter, the Doctor talks with the creature and makes a deal; Sarah discovers Professor Sorensen's dark secret which threatens to overwhelm him.
Starring Prentis Hancock, Graham Weston, Michael Wisher
S13, E7: Lost in the universe of antimatter, the Doctor talks with the creature and makes a deal; Sarah discovers Professor Sorensen's dark secret which threatens to overwhelm him.