Hex

Thomas Hector Schofield known as Hex was a staff nurse working for St. Gart's Hospital in London in the year 2021. He appeared to have missed out on History in Year Two, as he did not know what VE day was (BFA: Forty-Five). He was also good at making tea, and did not like basements.

Biography
Hex first met the Doctor and Ace when they were investigating signs of alien activity at St. Gart's. When Hex witnessed her going into a police box and demanded to know what was going on, Ace let him inside the TARDIS, shocking him outside of his limits. He assisted the Doctor and Ace in their investigation of 'xeno-tech' some alien technology, which was in fact Cyber Technology which had been reversed engineered. (BFA: The Harvest). After aiding the Doctor and Ace, Ace managed to convince the Doctor that Hex should join them on their travels.

Hex's hardships
Hex faced particular hardships, in particular at Drogheda during the siege of 1649. (BFA: The Settling) Then once more being tortured and (an attempt at) brain washing during the First World War at the hands of an operative of The Forge. (BFA: No Man's Land)

The Doctor would later come to realize that Hex was the same Thomas Schofield he knew as "Little Tommy," the son of Cassie Schofield. (who appeared in BFA: Project: Twilight and BFA: Project: Lazarus)

Over time, Hex began to feel that he, unlike Ace, might not be suited to the life of a TARDIS traveller. This feeling was intensified by his experiences on the planet Bliss during the Dalek war. The numerous deaths he witnessed at the hands of both the Daleks and the larval Kiseibya deeply affected him. (BFA : Enemy of the Daleks). In an attempt to help Hex heal from the emotional wounds he had suffered, the Doctor took him to Scutari in 1854 to allow him to meet his hero, Florence Nightingale. Hex opted to stay and help the nurses in the Crimean War rather than continue his travels with the Doctor and Ace. However, he met his friends again soon afterward, as the Doctor attempted to find the missing Ace. This adventure ended in his being shot with a musket. The Doctor and Ace rushed him into the TARDIS sickbay immediately, but he was already near death. (BFA: The Angel of Scutari). Hex is healed by The Forge in 2026, Nimrod and The Doctor tell Hex of his Mother's fate, Cassie is ressurected and both her and Nimrod are evaporated by alien technology. Hex confronts The Doctor and decides to walk away from his life in TARDIS all together. (BFA: Project Destiny)

Hex later rejoins the Doctor and Ace.(BFA: A Death in the Family)