Our episode begins In a remote Welsh mining town, a scientist Professor Mathers discovers how to speed up evolutionary mutation. Gwyllim Griffiths, a disgruntled local miner, volunteers for the experiment, threw a friend of his and potential love interest Cathy Evans, enabling the scientist to give him enhanced mental capabilities and, incidentally, a sixth finger on each hand. But when the mutation process continues while outside of the scientist's control, the mutant miner takes over the experiment. Now equipped with superior intelligence and telekinetic powers capable of great destruction, Griffiths decides to take revenge on the mining town he loathes. But, can Cathy and Mathers stop him for he does harm to the whole town and virtually himself. So once again were given an episode that pretty much follows the same plot line like I discussed in the last episodes review. A scientist usually taking something normal (usually a person) and conducting scientific experiments until said subject gets out of control and the whole thing pretty much ends horrifically with a morale narration at the end. This one is no different, but, the fact the the story goes at a really brisk pace and that we have two really good British actors in Edward Mulhare and David McCallum really helps. The ending is really good, but, you can defiantly tell the cheapness of the budget here, as the episode barely goes outside and and pretty much just has two inside sets. Plus Grittiths build up never really goes anywhere, he literally knocks a cop off his motorcycle and thats about it. The ending possibility that man can evolve past hate and what not is really great though. Overall the series manages to put out another good episode.