Jo was a main stay of the show, and with her departure, it was certainly an uncertain time.

However, the introduction of Sarah Jane, and her chemistry with the Third Doctor, made sure that this was smooth. From the off, the pair work perfectly, and even from this story alone, Sarah Jane's impact on the show will be evident. A strong character, not afraid to speak her mind - and she was given plenty of agency in this story.

The story itself is another Holmes triumph - he just got the show, and what made it special, and this story was certainly full of it. A great use of a historical setting, leading the way for the blueprint of pseudo-historical stories to come, and Linx the Sontaran ensured another entry into the pantheon of great villain species.

A proper classic story.