Synopsis:

The Enterprise is on a mission to the planet Parliament to deliver the delegates from the Selay and Anticans. On her way to Parliament, the Enterprise encounters a cloud in space with unique energy readings. Picard orders the ship for an impulse fly-by. The ship records the information and high tails it to Parliament. While the Enterprise did her scan, an energy being from the cloud planted itself in Worf. This creature goes from one crew member to another, killing one, and finally gets into Capt. Picard. Picard orders the ship back to the cloud and beams himself into it as energy only. Data soon figures out that Capt. Picard was not acting on his own will and quickly finds out a way to beam him back before he dies.