Furthermore, it was the first story in which Sgt. Benton's portrayer, John Levene, was given an annual contract, rather than employment as a day player. It also introduced what became UNIT's standard, green uniforms — the replacements for what Barry Letts disparagingly called the "chocolates" of Season 7 — and a new UNIT laboratory which would be used by the Third Doctor until the end of his exile. The Autons and the Nestenes would not appear on television again until Rose, the first episode of the revived series, in 2005.