ces ▁her ▁that ▁she ▁could ▁control ▁her ▁fer al ▁instinct s , ▁and ▁M ags ▁turns ▁on ▁the ▁Captain ▁instead . ▁After ▁the ▁Doctor ▁has ▁defeated ▁the ▁God s ▁of ▁R agn ar ok , ▁M ags ▁elect s ▁to ▁remain ▁behind ▁on ▁the ▁planet ▁with ▁King pin , ▁the ▁only ▁surv iv or ▁of ▁the ▁Psych ic ▁Circ us . ▁ ▁No ▁other ▁details ▁about ▁M ags — her ▁species , ▁whether ▁all ▁of ▁her ▁race ▁transform ▁into ▁were wol ves , ▁or ▁even ▁if ▁she ▁did ▁origin ate ▁on ▁V ulp ana ▁itself — are ▁provided ▁during ▁the ▁story . ▁ ▁" To oth ▁and ▁Cla w " ▁A ▁were w olf ▁is ▁the ▁principal ▁ant agon ist ▁in ▁the ▁T enth ▁Doctor ▁episode ▁" To oth ▁and ▁Cla w " ▁( 2 0 0 6 ). ▁This ▁were w olf ▁is ▁an ▁al ien ▁entity ▁that ▁fell ▁to ▁Earth ▁in ▁Scotland ▁in ▁ 1 5 4 0 , ▁where ▁it ▁land ed ▁in ▁St . ▁Catherine ' s ▁Glen ▁near ▁a ▁monaster y . ▁The ▁Doctor ▁sur m ises ▁that ▁only ▁a ▁single ▁cell ▁surv ived , ▁which ▁was ▁then ▁inc ub ated ▁in ▁various ▁hosts ▁via ▁bit ing ▁them , ▁passing ▁down ▁through ▁the ▁centuries ▁until ▁it ▁m ature d . ▁The ▁Doctor ▁describes ▁it ▁as ▁a ▁" l up ine ▁w avel ength ▁ha em ov ar iform ". ▁The ▁were w olf ▁shows ▁an ▁a version ▁to ▁mist le to e , ▁although ▁whether ▁this ▁was ▁a