简介：ThetracerdetectsthesecondsegmentontheplanetCalufrax.TheTARDISmakesabumpylanding,andtheDoctorandRomanasoondiscoverthattheyarenotonCalufraxatall.TheyareinfactonZanak,aplanetthathasbeenhollowedoutandfittedwithenginessothatitcantransmatthroughspaceandmaterialisearoundothers-suchasCalufrax-toplundertheirmineralwealth,leavingthemasshrunkenhusksheldbygravitationalforcesina'trophyroom'. OstensiblyinchargeistheCaptain,whosebodyhasbeenpartiallyreplacedwithroboticpartsfollowinganear-fatalcrash,butheismerelyapuppetcontrolledbyhisnurse-aprojectionofZanak'soriginalruler,theagedQueenXanxia. Xanxiaisusingtimedams,poweredbytheforcesgeneratedinthetrophyroom,tokeepherbodyaliveuntilthisnew,youngerformhasstabilised.TheCaptainpreparesZanakto'jump'again-thistimewithEarthasitstarget. TheDoctorattemptstothwarthisplans,callingontheassistanceoftheMentiads-agestaltoftelepathsamongstZanak'sindigenouspopulation-tosabotagetheengines. TheCaptainrebelsagainstthenurse,butshekillshim.ThenurseherselfisthendestroyedbyoneoftheZanaknativeswhomtheDoctor,RomanaandK9havebefriended. TheDoctorrealisesthatthesecondsegmentcomprisesthewholeoftheplanetCalufrax.Hecontrivestodropthecompressedhusksfromthetrophyroomintoaspace-timevortexcreatedbytheTARDISinthecentreofZanak,andisthenabletopickupandconvertthesegmentathisleisure.…