Bernice Summerfield: The Crystal of Cantus (6.5)

Fabled crystals from long-dead civilsations. Jason Kane blundering into situations out of his control. Entombed Cybermen waking from a century-long sleep. It's all in a day's work for Professor Bernice Summerfield.

Armed with her endless supply of witty quips and penchant for lost causes, she'll find the Crystal, rescue Jason, destroy the Cybermen and be home in time for supper.

Except, this time, it's different. This time, as the saying goes, it's personal.

And, after this adventure, things will never be the same again.