Probably because of its science fiction pedigree, this UK-produced series was typically positioned as a kid's show in the US market, airing in afternoons/early evenings. A bit ironic, in view of the adult-ish themes of most episodes: espionage, political intrigue, crime and conspiracy, even drug dealing. The thirteen season two episodes are presented on two discs; video transfers are crisp and clean with decent audio quality.
For the television Anglophile, these shows are a terrific video time capsule. Episode guest slots are filled with a stellar array of the era's movie/TV talent: Barbara Shelley, Duncan Lamont, Derren Nesbitt, Charles Gray, Sarah Lawson, Michael Ripper, and many others - some almost forgotten today. Also included is a delightful late fifties ambience, featuring staunchly British things like Hillman Minxes, Humber Super Snipes, and wonderful stock footage of RAF V-bombers roaring through the skies of cold war Britain. Often there's even local color on tap (pun intended): in episode "The Decoy", several minutes of location footage are shot both inside and outside a quaintly tudoresque Thames-side public house, The London Apprentice (apparently still in existence, judging from the pub review websites).