When an away team which includes O'Brien, Data, Troi, and Riker encounter a severe storm on the surface of a planet, they start to beam up but are knocked unconscious before this can happen. While passed out, three little spots of light enter the bodies of three of them. Riker is spared and recovers quickly, though he has a broken arm. He has all four beamed aboard. It isn't long before the aforementioned gain control of the ship. They are ruthless and cruel. O'Brien, of course, doesn't recognize Keiko or his own daughter. They eventually take over 10-Forward and hold hostages after injuring several of them. Deanna seems to be the one in charge while Data is the most unstable. He particularly despises Worf an tries to get into a confrontation but the big Klingon resists. The remainder of the episode involves a plot to take of 10-Forward and disable the invaders. Unfortunately, there are many pitfalls along the way as these characters seem to be one step ahead of the crew. The conclusion is very satisfying, making this one of the better episodes.
Review of Power Play
