The Claws of Axos standard. The story includes interior scenes inside the TARDIS for the first time in the Pertwee era of the show. The configuration of the TARDIS set-up is unique for this adventure. The TARDIS monitor appears to be a circular screen embedded in one of the 'roundels' in the console room wall, rather than the traditional rectangular screen (this feature is seen again once, a year later, on the unique set built for "The Time Monster"). The doors of the console room do not open directly into the exterior as in all other adventures; instead they open into a corridor that
That Which Survives glowing cube, apparently a computer. Three copies of Losira enter, one each for Kirk, Sulu, and McCoy. As they approach, Spock and a security officer materialize, and, at Kirk's command, destroy the computer. The three Losiras vanish. A projected image of Losira then appears on a wall, informing her "fellow Kalandans" that a disease has killed the station's personnel, and that the computer has been defending the station against intruders. McCoy surmises that the disease eventually wiped out the entire Kalandan species, and Spock suggests that the computer used images of Losira to do the job of defense. Kirk concludes