Dan Lewis
played by John Bishop
Dan is found on Earth an a dog-like protector, Karvanista and, after his house is shrunk, joins the Doctor and Yaz to fight the flux but after a narrow rescue from space when his helmet is breached he decides the Doctor and Yaz's life is not for him and he returns to Earth.
First regular appearance: The Halloween Apocalypse
Final regular appearance: The Power of the Doctor
Dan Lewis has met the following Doctors