Graham O'Brien

Graham O'Brien lived in Sheffield with his wife Grace and her grandson Ryan Sinclair. He had once worked as a bus driver.

Graham had cancer. He met his wife Grace, a chemo nurse while undergoing treatment. Once the cancer was found to be in remission, Graham married her and became her second husband.

Whilst returning home after an unsuccessful session of teaching Ryan how to ride a bike, Grace and Graham were trapped when a swarm of Gathering coils attacked their train in search of Karl Wright, a fellow passenger. He, along with Grace, Ryan and Yasmin Khan, helped the Thirteenth Doctor battle both the coil and its controller, Tim Shaw.

Whilst the Doctor recovered at his and Grace's home, he went around Sheffield to ask if anyone had seen anything unusual. Later, Grace and Graham followed the Doctor's orders to pose as construction managers and evacuate the construction site Karl worked at, so the Doctor, Ryan and Yasmin could rescue him.

However, the gathering coils were still active, with Tim Shaw using them to damage the crane that Ryan and the others were on. Despite Graham's protests, Grace climbed up and destroyed the creature by electrocuting it with live cables. However, Grace was also electrocuted in the process and fell to the ground. Mortally wounded, she died in Graham's arms, after telling him to not be afraid without her. Graham later spoke of how Grace inspired him during their three-year marriage at her funeral and felt guilty that he hadn't died instead. (TV: The Woman Who Fell to Earth)

Behind the scenes
Graham's character profile on the official BBC Doctor Who website, which this wiki does not consider a valid source, states that Graham originally moved to Sheffield from Essex.