Almost from the inception of the Star Trek canon, creatures have been able to take over the bodies of various characters, from Kirk to Janeway. This striking ability makes for some interesting plots, but it is kind of a cheap method of operation. Here, Keiko returns from a trip to Bajor and her body has been taken over by some entity. Miles is told that if he doesn't cotton to the demands of this thing, Keiko will die. So until he can figure out what to do, he must answer the call. The best part of this involves his enlisting Rom, Quark's hyperactive but incredibly talented brother, to assist him in bringing about these wishes. Rom is both insufferable and sweet as he plays his cards. Without him, the episode would be been dull. Almost as dull as Keiko's normal character.