Okay, first off I'll get this out of the way: it's clear that the folk putting these DVD releases together knew that they were faced with three, well, let's say 'less popular' stories, and found a very tenuous link for a boxset to get them out of the way - the fact that they were all inspired by Greek myths (Atlantis, Jason and the Argonauts, Theseus and the Minotaur). And while it's true that these wouldn't be my first choices to show casual fans of the new revamped Who, I think there's still much here for hardcore fans to enjoy. This is true of the extras - there may not be a huge amount, but what there is does give you a sense of what was going on behind the scenes.
Firstly, The Time Monster. I don't see why this always gets a bad press from fans. Yes it's a 6 parter and so there is some padding, but it's brimming full of fun ideas about time (which had been sorely missing from three years of UNIT stories by this point). There's plenty of different things to see throughout - Atlantis itself doesn't even appear until Episode 5 - and the idea of Kronos is a tantalising one. Admittedly the effect of a man in white with wings on wires doesn't always work, but at times it's quite striking. Plus at least it's a visually interesting story and quite experimental in places.
As is Underworld, at least in production. Sadly, story-wise it is a bit dull. A mysterious first episode sets the scene for adventure and even expands on Time Lord history, but it does degenerate into a bit of a runaround quite quickly which is a shame. However, production-wise this was quite revolutionary - 1970s inflation meant massive budget cuts vthe only way the cave scenes could be filmed was against a blue screen with CSO, which had not been done before to such a huge extent on any programme before. And surprisingly, it holds up well for the most part. Add to this the best spaceship modelwork in classic-Who, a nice spaceship set, cool weapons and decently thrilling lasergun battles, and it's not all bad. This is a DVD release that really benefits from the extras, making you marvel that it was made at all, and admiring it's pioneer spirit.
And so to The Horns of Nimon, a story once held up to ridicule as the worst of Who, but which has been reassessed in recent years. Where once it was declaimed as 'pantomime', now it is recognised as a lighthearted romp, and there's much fun here, once you get past the Nimon's silly arm gestures. Romana gets loads to do here, and while there are very silly moments, Lalla Ward and Tom Baker play the galactic menace in deadly earnest. This was the end of an era - last story produced by Graham Williams, last with the old theme tune arrangement - when Who returned for a new series it would be the glossy, serious The Leisure Hive, under the helm of John Nathan-Turner.
So, as with all of the old stories, there is something to admire and enjoy in all of these stories. Recommended for fans, but that's no bad thing.