A member of the Earth science team that finds the wreckage of a Borg sphere in the Arctic ice and becomes one of the first humans of her century to be assimilated.
Rooney appears in Regeneration. She is working with Drake and Moninger on an expedition to the Arctic Circle when the team uncovers debris and two frozen cybernetic bodies, the remains of the sphere destroyed over Earth in the film First Contact.
The researchers bring the bodies into their base camp and watch with fascination as the nanoprobes inside them begin repairs. The drones revive, and Rooney and her colleagues are attacked and assimilated.
The new drones modify the team's transport and leave Earth at increasing speeds, assimilating a Tarkalean freighter on the way. Enterprise is sent in pursuit and eventually destroys the ship, but not before the drones transmit a message towards the Delta Quadrant.