The Doctor's reality (Scream of the Shalka)

In one version of reality, the Ninth Doctor was accompanied in the TARDIS by the Master, who by that point inhabited an android body. The Doctor fought the Shalka with Alison Cheney, who joined him in the TARDIS. (NOTVALID: Scream of the Shalka, The Feast of the Stone)

Behind the scenes

 * These events are shown as a possible future in the novel The Tomorrow Windows.