While investigating the annihilation of an entire star system containing four billion inhabitants, the Enterprise comes under heavy attack from Nomad, a very small and extremely powerful cylindrical device of high intelligence that -- as Kirk and Spock will soon discover  -- at least partially originated from Earth. Its mission: to travel the galaxy and sterilize all life forms that it deems to be imperfect. That mission takes a dire turn for the worst when Nomad mistakenly identifies Captain Kirk as its creator, leading it to plot a new course to its point of origin, where it will carry out its prime function of death and destruction. "The Changeling" may not be a particularly groundbreaking episode of "Star Trek," but it sure is a gripping, well-made and entertaining one that features many iconic "Star Trek" moments. But what really sells it are the phenomenal performances of William Shatner and Leonard Nimoy, for it is their commitment to their craft that truly brings Nomad to life.

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