▁Who ' s ▁then ▁regular ▁home ▁of ▁R ivers ide ▁ 1 , ▁but ▁for ▁E pisode ▁ 4 ▁it ▁moved ▁back ▁to ▁L ime ▁Gro ve ▁D . ▁A ▁final ▁clip , ▁used ▁to ▁carry ▁the ▁story ▁into ▁the ▁subsequent ▁advent ure , ▁The ▁Mac ra ▁T error , ▁was ▁fil med ▁separately ▁during ▁the ▁making ▁of ▁that ▁story , ▁as ▁the ▁Mac ra ▁prop ▁was ▁too ▁large ▁to ▁be ▁brought ▁into ▁the ▁studio . ▁ ▁This ▁story ▁is ▁also ▁the ▁last ▁story ▁to ▁use ▁the ▁original ▁title ▁sequence ▁that ▁had ▁been ▁in ▁use ▁since ▁the ▁first ▁serial ; ▁the ▁next ▁serial ▁introduced ▁a ▁new ▁sequence ▁with ▁different ▁how lar ound ▁patterns ▁that ▁incorpor ated ▁Tr ought on ' s ▁face . ▁ ▁Cast ▁notes ▁This ▁story ▁features ▁the ▁debut ▁of ▁actor ▁John ▁Le ven e ▁( un cred ited ) ▁as ▁a ▁Cy ber man . ▁Le ven e ▁would ▁return ▁as ▁a ▁Yet i ▁in ▁The ▁Web ▁of ▁F ear ▁( 1 9 6 8 ), ▁and ▁would ▁go ▁on ▁to ▁play ▁the ▁regular ▁character ▁Serge ant ▁Bent on . ▁John ▁Rol fe ▁had ▁previously ▁appeared ▁in ▁The ▁War ▁Mach ines ▁( 1 9 6 6 ) ▁and ▁would ▁appear ▁again ▁in ▁The ▁Green ▁Death ▁( 1 9 7 3 ). ▁ ▁Alan ▁R owe ▁was ▁cast ▁as ▁Doctor ▁Evans , ▁an ▁early ▁victim ▁of ▁the ▁space ▁pl ague ▁and ▁also ▁provided ▁the ▁voice ▁of ▁Space ▁Control . ▁ ▁He ▁later ▁appeared ▁in ▁The ▁Time ▁War rior ▁( 1 9