Companion (Worlds in Time)

A companion of the Eleventh Doctor travelled with him to countless worlds, including Earth, Ember, and Messaline.

The companion's gender and species varied, as various tellings indicated that they were either a human, a Silurian, a Catkind, or a Tree of Cheem.

They encountered many species, including Autons, Clockwork Droids, Zygons and Daleks. (NOTVALID: Worlds in Time)

Behind the scenes

 * In the video game Doctor Who: Worlds in Time, the player could choose his character's gender, name, and race. The supplied races were human, Catkind, Silurian, and Tree of Cheem.