Commander Sisko offers to take Jake on a science project through the wormhole to study a planet in the Gamma Quadrant. Jake brings Nog along to help him pass Mrs. O'Brien's science class. Along with Quark, who comes along to persuade Sisko to approve his new business scheme for Deep Space Nine, the Commander and the two boys begin their survey of a planet. On the first night, Commander Sisko and Quark are taken prisoner by the Jem'Hadar, the warriors of the Gamma Quadrant's Dominion.