Season: 4

Original Airdate: 1/21/2005

Writer(s): Judith Reeves-Stevens & Garfield Reeves-Stevens
Director(s): Mike Vejar

Guest Stars
None

Stardate: Unknown

Synopsis: Noncorporeal aliens inhabit the bodies of Enterprise crew members to study how the crew reacts to a lethal virus infection that has afflicted Trip and Hoshi.

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