The Doctor (Battle for the Universe)

An incarnation of the Doctor travelled in time and space with Ace, Romana, Tegan and K9. (NOTVALID: Battle for the Universe)

Biography
The Doctor teamed up with Ace, Romana, Tegan and K9 to beat three parallel parties intent on taking control of the universe. One was led by the Master, another by Davros and a third by a Cyber-Controller. In the course of this adventure, the Doctor wielded a Sonic Gun and had to make use of the Key to Time. The Doctor had access to four regenerations. (NOTVALID: Battle for the Universe)

Physical appearance and clothing
The Doctor had long blonde hair and a thin, clean-shaven face with pale skin. He wore an olive-green, wide-brimmed hat and a striped red-and-white shirt with a high collar, partially unbuttoned to reveal golden cloth underneath. (NOTVALID: Battle for the Universe)

Behind the scenes
This Doctor is never explicitly numbered. However, he is depicted as having four remaining regenerations. This would logically place him as a possible Ninth Doctor.