▁" f ant astic ". ▁It ▁took ▁about ▁three ▁and ▁a ▁half ▁hours ▁for ▁Andrew ▁Bro oke ▁to ▁have ▁all ▁the ▁make - up ▁applied . ▁Due ▁to ▁the ▁cost ume , ▁Bro oke ▁had ▁to ▁act ▁with ▁just ▁his ▁left ▁eye . ▁Smith ▁had ▁pra ise ▁for ▁guest ▁actors ▁Ben ▁Brow der , ▁who ▁he ▁said ▁"[ made ] ▁a ▁good ▁cow boy " ▁with ▁" that ▁great ▁draw l ", ▁and ▁Ad rian ▁Sc ar borough , ▁who ▁he ▁said ▁" ste als ▁the ▁whole ▁episode ". ▁Brow der ▁was ▁offered ▁the ▁role ▁and ▁glad ly ▁accepted ; ▁he ▁was ▁aware ▁of ▁the ▁show ▁as ▁his ▁children ▁had ▁watched ▁it , ▁and ▁he ▁also ▁wanted ▁to ▁do ▁a ▁western . ▁Wh ith ouse ▁was ▁" th ril led " ▁with ▁Brow der ' s ▁performance , ▁as ▁it ▁was ▁how ▁he ▁imag ined ▁the ▁character . ▁ ▁" A ▁Town ▁Cal led ▁Mer cy " ▁and ▁the ▁previous ▁episode , ▁" D in osa urs ▁on ▁a ▁Sp aces hip ", ▁were ▁the ▁first ▁episodes ▁to ▁be ▁produced ▁for ▁the ▁sevent h ▁series , ▁and ▁both ▁were ▁directed ▁by ▁Sa ul ▁Met z stein . ▁The ▁two ▁episodes ▁are ▁Met z stein ' s ▁first ▁Doctor ▁Who ▁cred its . ▁Much ▁of ▁the ▁episode ▁was ▁fil med ▁around ▁the ▁desert ▁area ▁of ▁Al mer ía , ▁Spain , ▁where ▁stud ios ▁have ▁built ▁Wild ▁West - style ▁streets ▁that ▁have ▁been ▁used ▁in ▁the ▁making ▁of ▁over ▁ 1 0 0