chunk: Other nations are racing to colonize space, and they would stop at nothing, not even sabotage, to thwart the United States effort. It turns out that Dr. Zachary Smith (Jonathan Harris), Alpha Control's doctor, and later supposedly a psychologist and environmental control expert, is moonlighting as a foreign secret agent for one of those competing nations. After literally disposing of a guard who catches him onboard after hours, Smith reprograms the Jupiter 2's B-9 environmental control robot, voiced by Dick Tufeld, to destroy critical systems on the spaceship eight hours after launch. Smith, however, unintentionally traps himself aboard at launch and his extra weight throws the Jupiter 2 off course, causing it to encounter a meteor storm. This, plus the robot's Smith-programmed rampage causing the ship to prematurely engage its hyperdrive, causes the expedition to become hopelessly lost in the infinite depths of outer space.