Where Silence Has Lease
Star Trek: The Next Generation Season 2

The Enterprise is sent to the Morgana Quadrant, only to be detoured into a bizarre, mazelike "space void." While trying to figure out a means of escape, the crew comes across a derelict space vessel. Unbeknownst to them, the vessel contains an alien observer named Nagilium (Earl Boen), who happens to be conducting an experiment in behavioral study with the Enterprise crew as his own personal laboratory rats. First broadcast December 3, 1988, "Where Silence Has Lease" was written by Jack Sowards.