I first bought this series two 'Lost in space' for my son (age 9) and he loves it (it is packaged just like the series 1 set). We watch about an episode or two a week (so have weeks to go). The series 2 was 'Lost in space' as I remember it: classy and very bold colourful sets, funny, with an increasingly camp Dr Smith having more catch phrases than Arthur Askey ("Spare me the barbs Major", "You posturing ninny"). In fact the robot's tagline 'It does not compute' was a favourite phrase of mine during my schooldays. I did vaguely remember the B&W first series as well (particularly the excellent first few episodes concerning leaving Earth eg. 'The reluctant stowaway') and knew Dr Smith, the Jupiter II and the crew were all present and correct. However I had forgotten how dark, menacing and calculating Dr Smith was compared to this second series. My son found series one too frightening to watch past the first few episodes, and was particularly disappointed with the B&W TV images - although I found these episodes far more interesting than those in the second series - but even I did miss the series 2 gaudy colour, although the B&W sets and effects are just as 'good'. By this second series the title should have been changed to 'The Dr Smith, Will Robinson and Robot show', where the comic talents of Jonathan Harris, Billy Mumy and Bob May (inside the robot) are increasingly in evidence (nicking some of competitors Batman's camp visual style) - this is reflected in this DVD set's cover art. The third series corrected this imbalance a little, giving other short changed cast members better parts.
So if you are buying for your children I would miss series one and skip straight to this series two, giving a two minute intro. But if you want a bit more bite then go for series one as well. Be warned though there are around thirty episodes in this 8-disk DVD collection - over twenty hours of prime time TV from 1966/1967 (Series One is the same length but from 1965/1966 and in B&W). So very good value at least, and the picture quality and production values of these series 2 (and 1) DVD's is top notch. The set has English language and English subtitles only. No extra's, although in both the very nice packaging includes a cute little pull-out booklet of the episodes and characters. In 2008, when we get through all 50+ episodes from series 1 & 2, we may risk series three despite the very poor DVD picture quality warnings from other reviewers. The expected fourth season of Lost in Space was ironically cancelled despite high ratings, due to Fox's financial disaster with Cleopatra reducing the available budget of Lost in Space to a point where creator, Irwin Allen, refused to continue.