Graham O'Brien
played by Bradley Walsh
Graham, along wit step-grandson Ryan Sinclair, was on board the train that the Thirteenth Doctor crash landed in. After helping the newly regenerated Thirteenth Doctor he was accidentally sucked into space and joined the Doctor after his rescue.
After returning to Earth when Ryan decides to stay behind Graham does the same to be around for his grandson.
First regular appearance: The Woman Who Fell to Earth
Final regular appearance: Revolution of the Daleks
Graham O'Brien has met the following Doctors
Graham O'Brien has appeared in the following adventures