Zack Allan is a character in the fictional universe of the science-fiction television series Babylon 5, played by the late Jeff Conaway. He regularly appeared in the show from season 2 onwards. During the second and third seasons of the series he was a security officer on the Babylon 5 station. In the fourth season, he was promoted to become Babylon 5's Security Chief and he retains that position through to the end of the series' fifth and final season.
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“It is the curse of a certain order of mind, that it can never rest satisfied with the consciousness of its ability to do a thing. Still less is it content with doing it. It must both know and show how it was done.”
—Edgar Allan Poe (1809–1849)