"The Deadly Years" is definitely one of the best episodes of the original Star Trek. Kirk and the crew find some old people on a planet that say they are only 25 and 28. However, they look like they're in their 90's. Soon afterwards, the crew beams back onboard the Enterprise and discovers that everybody, with the exception of Chekov, that beamed down to the planet is turning old quickly. Dr. McCoy or somebody must find a cure for the disease before they die of old age in only a matter of a few days."The Deadly Years" features some of the best makeup of any TV show or movie from the 60's, and also some of the best acting. Captain Kirk and Dr. McCoy put on the two best performances, they will make you think they really are old and frail. "The Deadly Years" is a classic episode of the series and Kirk does some of his best commanding at the end of the episode. This is one episode you won't forget.