A touching heartfelt bridge between the two eras. Yes, some foes return in Series 1, and the Doctor and the TARDIS is there. But the moment Sarah Jane appears, that bridge between the eras, to cement that this is the same show, is there. The reunion between the two is brilliant - the acting from all involved made these feel monumental as a child, and then, to revisit having watched all of Classic Who, and dipping into the extended universe, to explore in greater depth the relationship between them, it feels more special. At its heart, that is the story - the reunion between the two best friends.

The regular components of the story also point to just a good Doctor Who story. A well realised and fleshed out villain, with an instantly recogniseable and brilliant design - its ridiculous they haven't been used within the main show since (some extended universe appearances aside). Superbly performed by Anthony Head, the Tenth Doctor really falls into his stride when confronting this villain.

Some tiny issues though, really stop this from being perfect - and as much as I rave around Sarah Jane's reintroduction, this relationship and conflict with Rose has never won me over. It feels forced and almost reductive for both characters. In a story to reintroduce her and show how, with this small exception, brilliant she is, it doesn't quite hit the mark for her strong characterisation. At least, it is nice to see this mostly resolved towards the end, with the olive branch, and offer to join the TARDIS team.