Hex

Thomas Hector Scholefield, known as Hex, (born 12 October 1998) was a staff nurse working at St. Gart's Hospital in London in the year 2021.

Biography
He was raised by his father and maternal grandmother, whom he believed to be his mother until he was six years old. (BFA: Night Thoughts) He only had one photograph of his actual mother, who died in November 2004, which was in his flat in Shoreditch. He later regretted not retrieving it before beginning his travels with the Seventh Doctor and Ace. (BFA: No Man's Land)

As a child, he appeared to have missed out on history in year two, as he did not know what VE Day was. (BFA: Casualties of War)

Hex first met the Doctor and Ace when they were investigating alien activity at St. Gart's in October 2021. When Hex saw Ace going into a police box and demanded to know what was going on, she let him into the TARDIS. He assisted the Doctor and Ace in their investigation of 'xeno-tech', alien technology, which was in fact Cyber Technology which had been reversed engineered. After that, Ace managed to convince the Doctor that Hex should join them on their travels. (BFA: The Harvest)

Hex's hardships
Hex faced particular hardships, in particular in Drogheda, Ireland during the siege of September 1649. (BFA: The Settling) He was tortured and subjected to brainwashing during the First World War in 1917 at the hands of Sergeant Wood, an operative of the Forge. (BFA: No Man's Land)

Shortly after meeting Hex for the first time in 2021, the Doctor came to realise that he was the same Thomas Scholefield that he knew as "Little Tommy," the son of Cassie Scholefield, whom he had met during his sixth incarnation while travelling with Evelyn Smythe. (BFA: Project: Twilight, BFA Project: Lazarus)

Over time, Hex began to feel that he 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 many deaths that he witnessed at the hands of the Daleks and the larval Kiseibya deeply affected him. (BFA: Enemy of the Daleks)

To help Hex heal from the emotional wounds he had suffered, the Doctor took him to Scutari in September 1854 to meet his hero, Florence Nightingale. Hex chose to stay and help the nurses in the Crimean War rather than continue his travels. 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 almost died. (BFA: The Angel of Scutari)

Hex was taken to the Forge to be healed in 2025. In the Forge base, Nimrod and the Doctor told Hex of his mother's fate. Hex's mother, Cassie was resurrected and fought for Nimrod until they were evaporated by alien technology. Hex decided to walk away from his life in the TARDIS. (BFA: Project: Destiny)

Hex later rejoined the Doctor and Ace after the Sixth Doctor's former companion Evelyn Smythe gave him her account of the Doctor's involvement with his mother's death. (BFA: A Death in the Family) The time travellers subsequently journeyed to Alaska in 1934. (BFA: Lurkers at Sunlight's Edge)