The only "new" material to surface from the BBC in 1993 (Dr Whos 30th anniversary) was this 5 part radio play reuniting the 1974 team Jon Pertwee (The Doctor), Elisabeth Sladen (Sarah-Jane Smith) and Nicholas Courtney (Brigadier Lethbridge-Stewart). The cast also includes other well known dr who guest artists like Peter Miles (Nyder in Genesis Of The Daleks) and Maurice Denham (Azmel in The Twin Dilliema), both of which act their parts particularly well. The story starts off in London where a new "Space Theme Park" has opened in Hamstead. Unusual goings on at the space park attract the attension of UNIT (United Nations Intelligence Taskforce, The Doctor is their scientific adviser). The Doctor soons finds out that the owners of the space park are in fact aliens intent on infiltrating the world by creating more space parks all over the planets capital cities and lobotomising the theme park visitors. Sounds a bit lame but the action soon moves to the aliens home planet of "Parakon" where there are major political rifts being caused by cultural class divisions and a very corrupt government who are slowly killing the planet by harvesting crops which turns the green fields to deserts. They are also selling arms to both sides of conflicts on other planets and have most of their own civilians brain-washed by using electronic brain implants which drug them into zombie states. The Doctor and friends are set on making the planets president see what underground activities his government are involved in and freeing the under classes living in isolation. After 19 years the actors resurrect their characters very faithfully and the writer Barry Letts (the TV series producer in the Jon Pertwee era) creates an excellent platform for a new 90's based play, whilst remaining faithful to the format of the show back in the 70's. Much better than the second effort "The Ghosts Of N-Space" from 1995. Definately not to be missed !