This episode was most notable for marking the return of original series companions Sarah Jane Smith and K9, both having last appeared on-screen in 1983's The Five Doctors. K9 Mark III was destroyed and replaced by a newer model at the end of the episode. Months after this episode aired, rumours of a spin-off series with Sarah Jane were confirmed by the BBC and The Sarah Jane Adventures premiered on BBC One on 1 January 2007.
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