Alpha Centauran (Doctor Who? 129)

An Alpha Centauran, along with a Dalek, Cyberman, Sontaran, Ice Warrior, Sea Devil, Zygon and Draconian, waited disinterested in the BBC lounge whilst the Seventh Doctor watched Doctor Who. After Doctor Who finished and the 350th re-run of Star Trek begun, all of the group gathered eagerly on the sofa to watch the broadcast on the television, leaving the Doctor to wonder if they were all trying to tell him something. (NOTVALID: Doctor Who? 129)

Behind the scenes
It is possible this character is intended to be Alpha Centauri from The Curse of Peladon but they are never explicitly identified.