Braxiatel (Regenerators' timeline)

Councillor Irving Braxiatel sat on the Inner Council in an alternative Gallifrey. (AUDIO: Forever) President Romana found him oilier than the version that she knew. (AUDIO: Arbitration)

When the Daleks invaded his reality, a Dalek encountered and scanned him. The scan determined that they were familiar with him and that he had previously helped the Daleks. Upon hearing this, Braxiatel offered to join with them. However, the Dalek said that the Irving Braxiatel they had known has betrayed them and, determining the Braxiatel before them to be an enemy of the Daleks, they exterminated him. (AUDIO: Extermination)

Behind the scenes
The past alliance between the Daleks and the other Irving Braxiatel which the Daleks refer to and that this Braxiatel is unfamiliar with was in Death and the Daleks.