Oh wow. This is really peak Doctor Who, classic or modern.

I've not seen many Adric stories and I've seen even less of the Peter Davison era; but watching this perfectly paced, smartly written, suspenseful and tragic story which serves as both a cracking showdown between the Doctor and one of their greatest enemies (with genuinely apocalyptic stakes), and a mini redemption and legitimately shocking and heartbreaking sendoff for a largely despised character... yeah, there's a whole other era of the show I want to fully rinse now.

Absolute must see - up there with City of Death, Inferno, Pyramids of Mars and Genesis of the Daleks for some of my favourite Classic Who serials.