On the eve of Jed's participation in a national television conference with thousands of school children as the Galileo probe arrives at Mars, NASA loses the communication link; Leo contends with a Russian ambassador who denies that a fire has broken out in a nuclear missile silo; C.J. and Sam accompany Jed to a concert where they're each faced with people they'd rather not see; Josh and Donna work on the nomination for the next person to appear on a postage stamp; C.J. wrangles a minor controversy ignited by a leak that Jed doesn't like green beans.