A 1973, Doctor Wanda actress Katy Manning, wanda aka wasa na uku Doctor ta mataimakin Jo Grant daura da Jon Pertwee, aka barin jerin; Z-Cars m Ron Craddock ya ba Sladen wani m shawarwarin zuwa Doctor Wanda m Barry Letts. Sladen isa a gwaji ba da sanin shi ne ga sabon abokin rawa, kuma ya yi mamakin Letts ta thoroughness. Ta aka gabatar da Pertwee, wanda ta samu intimidating a lokacin. Kamar yadda ta hira da Letts da Pertwee, a duk lokacin da ta juya ya dubi daya daga cikinsu da sauran zai nuna wani babban yatsa-up.
Sarah Jane Smith