First Doctor

An alternative universe version of the First Doctor is an incarnation of the Doctor.

Biography
The First Doctor travelled with Steven Taylor and Dodo Chaplet. On one of their travels, they went to 13th century city of Kiev. A short period after, they went to Logopolis. (He Jests at Scars... (audio story))

The Valeyard’s Attempted Course Corrections

At some point, the First Doctor met the Valeyard. (He Jests at Scars... (audio story))

Later, the Valeyard had planned to go back in time and kill Dodo in order to prevent his first visit to Logopolis, in order to prevent his fourth self’s visit to Logopolis. It is unknown if he succeeded. (He Jests at Scars...)

Possible Erasure or Death

The Valeyard told Melanie Bush that he unintentionally destroyed any possibilities of him existing. It’s possible that the First Doctor was either erased or killed. (He Jests at Scars... (audio story))