The BBC’s ongoing process of re-releasing select seasons of classic Doctor Who on Blu-ray has brought with it another joy beyond simply getting high-quality collections of iconic seasons of the show. That joy? Bringing in familiar faces to goof around in character for the announcement trailers.
Source: io9 – Jo Grant Is Back to Kick Giant Maggot Ass in This Delightful Doctor Who Season 10 Blu-ray Trailer