▁Spo on er . ▁ ▁Other ▁than ▁the ▁Doctor ▁and ▁Susan , ▁the ▁Mon k ▁was ▁the ▁first ▁member ▁of ▁the ▁Doctor ' s ▁species ▁to ▁appear ▁in ▁the ▁programme , ▁and ▁the ▁second ▁Doctor ▁Who ▁villa in ▁( after ▁the ▁D ale ks ) ▁to ▁make ▁a ▁return ▁appearance . ▁ ▁Character ▁The ▁Mon k ▁was ▁the ▁poss essor ▁of ▁a ▁st olen ▁Mark ▁IV ▁T ARD IS ▁– ▁superior ▁to ▁the ▁Doctor ' s ▁and ▁with ▁a ▁fully ▁function ing ▁cam ou fl age ▁unit ▁( ident ified ▁as ▁such ▁in ▁The ▁Time ▁Med d ler , ▁the ▁more ▁well - known ▁term ▁" ch ame le on ▁circuit " ▁was ▁first ▁used ▁in ▁Log opol is ) ▁. ▁The ▁Doctor ▁hypoth es ised ▁that ▁the ▁Mon k ▁left ▁the ▁Doctor ' s ▁then - unn amed ▁home ▁planet , ▁some ▁ 5 0 ▁years ▁after ▁the ▁Doctor ▁did . ▁ ▁At ▁this ▁early ▁stage ▁in ▁the ▁history ▁of ▁the ▁series , ▁the ▁name ▁Time ▁Lord ▁and ▁the ▁details ▁of ▁the ▁Doctor ' s ▁orig ins ▁had ▁not ▁yet ▁been ▁de vised . ▁ ▁The ▁Mon k ▁liked ▁to ▁med d le ▁in ▁history ▁and ▁to ▁change ▁it ▁for ▁his ▁own ▁am usement ▁and ▁for ▁what ▁he ▁considered ▁to ▁be ▁the ▁better : ▁l ending ▁mechanical ▁assistance ▁to ▁the ▁build ers ▁of ▁Stone hen ge ; ▁giving ▁Leon ardo ▁da ▁V inci ▁tips ▁on ▁aircraft ▁design ; ▁making ▁money ▁by ▁using ▁time ▁travel ▁to ▁explo it ▁comp ound ▁interest ; ▁and