简介：S13E21-26 TwoalienseedpodsarefoundburiedintheAntarcticpermafrostandtheDoctorrealisesthattheyarefromaKrynoid,aformofplantlifethatinfectsandtransformsallanimallifeonplanetsuponwhichitbecomesestablished. OneofthepodsinfectsascientistatanAntarcticbasebutthedevelopingKrynoidisdestroyedbyabombsetbytwomen,ScorbyandKeeler,whohavemadeoffwiththeotherpodfortheirboss,eccentricplantcollectorHarrisonChase. AthismansioninEnglandChasearrangesforthepodtobeopenedundercontrolledconditionswhileahumanhost-Sarah-isheldnearby.TheDoctorrescuesSarah,butKeelerisinfected.Keeler'stransformationintoaKrynoidisacceleratedbyChase,whohashimfedwithrawmeat. Thecreatureescapesandgoesontherampage,rapidlygrowingtogiantproportions.ChasedecidestoturntheDoctorintocompostbyfeedinghimintoapulverisingmachine.TheTimeLordescapes,butChasefallsintothemachineandiskilled.UNIThavemeanwhilebeencalledin,andtheyarrangefortheKrynoidtobebombedbeforeitcanspreaditspodsacrosstheEarth.…