Stardate: 46519.1 – Troi is abducted and surgically altered by the Romulans as part of a ploy to smuggle intelligence operatives into the Federation.

Riker is abducted by a xenophobic race of aliens during a first contact mission. They believe the Enterprise is a scout for an invasion.

Stardate: 42609.1 A strange power source disables the Enterprise’s computer systems, damages Data’s programming and leaves the ship and crew vulnerable to a Romulan attack.