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"Harbinger" is the sixty-seventh episode of Star Trek: Enterprise, the fifteenth episode from the third season. The episode aired on UPN on February 11, 2004. "Harbinger" works together three plot lines in a single episode: the T'Pol-Tucker relationship, the Hayes and Reed tension and uncovering the nature of a mysterious alien discovered in an anomaly and its possible links to the expanse sphere builders. Guest star Thomas Kopache plays the alien guest and Noa Tishby plays Amanda Cole, the third in the T'Pol-Tucker love triangle.
