Over the years "The Krotons" has come under fire from scornful fans, complaining that Troughton classics like "Fury From the Deep" were wiped while this story still exists. That's unfair for several reasons. Firstly, when a story no longer exists it can gain an element of myth. Secondly, this story is actually a lot of fun. Whereas "The Dominators" is a truly dull drag only raised by the main cast, this is a flawed but enjoyable little self-contained story. It's also the first story by Robert Holmes, classic Who's finest writer. He's still finding his feet but gives us an intriguing mystery along the way.
As always the three leads are a joy, particularly when the Doctor and Zoe have a go on the learning machines. The Gonds often get a slagging but they're okay really - Philip Madoc's deliciously evil eyebrows make their Who debut in this story. Then there's the Krotons themselves. Again they get mocked by fans, but with their unusual crystalline heads and roaring voices they're actually quite effective. Admittedly in long-shot with their skirts showing they are a bit lumbery, but in their lair they are better than many Who man-in-a-suit monsters.
For the time being, this is the last Troughton story to be released on DVD. I hope that like many other classic Who stories its reputation gets a more generous re-appraisal. It starts here - I openly admit my love for "The Krotons"!