N'afọ 1973, onye na-eme ihe nkiri Doctor Who bụ Katy Manning, onye na-egwu onye enyemaka nke atọ Doctor Jo Grant na-emegide Jon Pertwee, na-ahapụ usoro ahụ; Onye na-emepụta Z-Cars bụ Ron Craddock nyere Sladen nkwanye ịnụ ọkụ n'obi nye onye na-emepụta Doctor Who bụ Barry Letts. Sladen rutere na nnwale ahụ n'amaghị na ọ bụ maka ọrụ ọhụụ ọhụrụ, ọ tụrụ ya n'anya nke Letts. A kpọbatara ya na Pertwee, onye ọ hụrụ na ọ na-emenye ụjọ n'oge ahụ. Ka ya na Letts na Pertwee na-akparịta ụka, oge ọ bụla ọ tụgharịrị ile otu n'ime ha anya nke ọzọ ga-egosi mkpịsị aka aka. E nyere onye na-egwu egwuregwu bụ Sarah Jane Smith na mbụ, mana o kwuru na n'oge mmeghachi omume maka The Warrior Time, onye na-emepụta Z-Cars bụ Ron Craddock nyere Sladen nkwanye ịnụ ọkụ n'obi na onye na-emepụta Doctor Who bụ Barry Letts.
Afọ 1973