Stardate 47391.7: Dr. Mora Pol, the scientist who took care of Odo after he was found (and the prototype for the shapeshifter's hairstyle), visits the station with a possible clue to Odo's origin. Odo, Mora, Dax and the Mora's assistant Dr. Weld take a runabout to a planet in the Gamma Quadrant where they locate a tiny lifeform that may be related to Odo. But then poisonous volcanic gases erupt, and only the seemingly unaffected Odo can save the rest of the away team. Back on Deep Space 9, the three injured scientists are taken to the infirmary. O'Brien carries on with the studies but then the science lab in which he keeps the lifeform is demolished, apparently by the lifeform itself which is missing. But a more detailed analysis of Dr. Mora comes to the conclusion that Odo must be the culprit. The security chief doesn't believe his mentor until he morphs into the violent creature. Shutting off the power on the station, the crew manages to capture Odo in a forcefield and remove the traces of the detrimental gas from his substance.

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