Rooney was a researcher with the Earth Sciences Institute and was a member of the A-6 excavation team, the Arctic Archaeology Team, in 2153.
That year, the team journeyed to the Arctic Circle in the Arctic on Earth. After they arrived aboard the transport Arctic One, they found the debris of an alien ship. Rooney, Drake, and Moninger also found the body of a Borg drone, concealed under ice. A short time later, Rooney found another body under the snow.
The team decided to build a base camp to study the two Borg drones and also the fragments of the alien ship. Rooney scanned several of the debris pieces and found proof, inside the glacier, that these pieces were over 100 years old. Later outside, Rooney discovered the ship's transwarp coil while talking to Drake. The two went back to the research module when they heard screams and saw the fire of a phaser rifle.
They found Moninger inside the module, under some equipment. When Rooney turned around to get a medical kit, she almost ran into a Borg drone.
Assimilated by the Borg, Rooney herself became a Borg drone. Aboard the assimilated Arctic One, she tried to stop Captain Jonathan Archer and Lieutenant Malcolm Reed, an away team from Enterprise NX-01, but was fired upon and killed with a phase-pistol. Archer then identified her as one of the researchers from the arctic team. (ENT: "Regeneration")
