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Responding from a call from the Sheliak Corporate, the Enterprise crew is confronted by hostile Sheliaks at the Tau Cygna Five earth colony. Citing an old treaty, the Sheliaks demand that the human colonists evacuate the planet within four days or face total annihilation. It is up to Data to persuade the intractable colonists to leave...all 15,000 of them. Originally telecast October 7, 1989, "The Ensigns of Command" was written by Melinda M. Snodgrass.