The Enterprise is sent to deflect the path of an asteroid that is on a collision course with a Class-M planet. They reach there with enough time to go down to the planet's surface and explore it. Kirk, Spock, and McCoy beam down and find the planet is much like Earth. It is even populated by groups of people similar to Native Americans. Kirk goes missing and the Enterprise is forced to leave him behind and divert the asteroid's path without him.
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Warning: Star Trek season 3 episode 3 guide may contain spoilers