Stardate 46154.2: For several days Commander Riker is suffering from inexplicable exhaustion, along with amnesia and paranoia, as if he didn't get enough sleep. Some more crew members are plagued by similar symptoms, including Worf and Geordi. In the holodeck Deanna reconstructs what seems to be a common memory of all victims: an alien lab of some kind. Beverly's examination shows that Riker's arm was severed and reattached by someone. In addition, Data's memory of ninety minutes is missing, and there are strange readings of subspace energy in a cargo bay. The crew members were abducted to an unknown place, possibly somewhere in subspace. One of them dies after his return because his blood was turned into a polymer. Armed with a stimulant and a homing beacon, Riker volunteers to track where the missing people are being taken. He is abducted into subspace once more and wakes up in a lab with solanogen-based creatures. They are trying to keep the rupture open that Geordi wants to seal in order to prevent further damage to the ship. While the lifeforms are distracted, Riker grabs the last missing crewmate and dashes back as the rupture closes.

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