 Deep Space Nine detects an unknown ship coming from the Gamma Quadrant at the other side of the wormhole. The ship has severe engine trouble and its pilot seems very nervous and reluctant to accept any help. Finally O Brien convinces him to come on board. He introduces himself as Tosk and he apparently comes from a very different culture as he understands nothing of the ways of the Alpha Quadrant. He claims the wormhole caused the ship s problems. O Brien seems to really like the guy, but senses quickly he has a secret. He also finds out Tosk lied, discovering his ship has weapons damage. Then Tosk is caught trying to open a weapons locker by Odo.