First Doctor

The First Doctor was an iteration of the Unbound Doctor.

A Time Lord from the planet Gallifrey, he grew up with the Master and was friends with him while they were in school. One day, he stole a TARDIS and ran away. During his travels, his TARDIS got stuck in the shape of a police box. (AUDIO: Sympathy for the Devil)

Later on, he landed on Skaro and led the Great Siege, which led to their liberation from their Daleks. (AUDIO: Masters of War)