Dr. Mora Pol, Odo's mentor arrives on Deep Space 9 intent on resuming his search for Odo's true origin. Following Dr. Mora's leads, they travel to planet L-S VI in the Gamma Quadrant and bring back a silicate-based lifeform, which wreaks havoc on the station.

James Sloyan (Dr. Mora Pol)
Matt McKenzie (Dr. Weld Ram)

• The trip from Bajor to DS9 takes five hours.
  
• The "monster" turns out to be Odo, who was affected by the gas that knocked out the away team.