Played by​ Paul McGann

05/12/2017 (S19 E61)

13/11/2018 (S20 E46) – Deceased

Last Appearance:

20/11/2018 (S20 E47) – Corpse

Consultant Neurosurgeon & Professor

John Gaskell is a professor of medicine, consultant neurosurgeon and director of surgical innovations. John attended university with Henrik Hanssen and Roxanna MacMillan, John has used stem cell treatment to reverse motor neurone disease.

Gaskell killed his friend Roxanna by locked in syndrome, and later poisoned her. In November 2018, Gaskell took his own life after being found out by his collegues as to what he had been up to during his research and by killing innocent people.