Seventh Doctor (Death Comes to Time)

A version of the Seventh Doctor travelled with Ace and Antimony. He saw the Canisians destroyed in a war started by Tannis, but he saved some of the species in his TARDIS.

He investigated the deaths of Time Lords Valentine and Antenor. During these events he met the Minister of Chance. The Doctor later led a further investigation into the Blue's Bar massacre with the assistance of Speedwell, so together they discovered Nessican was responsible for the deaths. Due to the events the Doctor poisoned Nussican with his blood after consuming garlic.

Later on, he tried to defeat Tannis' plot of invasion. Upon doing so he rescued Bedlar's child, eventually meeting face to face with Tannis when returning the child.

A frustrated Tannis shot the Doctor's beloved companion Antinomy to death. The Doctor was now in despair, so he travelled back to companion Ace where they noticed the death of Nuscan.

The Doctor caught up with the Minister of Chance and and convinced him to stop his madness. The Minister threatened to kill the Doctor but eventually backed down.

He returned to Earth one last time to kill Tannis, however time assisted by Brigadier Alistair Gordon Lethbridge-Stewart. He returned to Tannis and saved Ace but at a cost. He had to sacrifice himself to kill Tannis. After doing so, the only thing that remained was his burnt question mark umbrella.

The Kingmaker suggested that everyone dies and that the Doctor may only be dead in this world; suggesting he is alternate. (WC: Death Comes to Time)

Behind the scenes
The Big Finish audio drama Zagreus made it even clearer that this Doctor's timeline was alternate.