A Starfleet chief aboard the refitted Enterprise who takes over the navigation console when Lieutenant Ilia is carried off by the V'Ger probe.
Chief DiFalco appears in Star Trek: The Motion Picture. She is one of the bridge complement during the Enterprise's hurried departure to intercept the cloud approaching Earth.
When a column of plasma energy invades the bridge, it scans the ship's records and vanishes, taking Ilia with it. Kirk calls DiFalco forward to the empty station, and she serves as navigator for the rest of the flight into V'Ger.
It is she who reports their position as the ship is drawn towards the centre of the vessel and, at the end, takes Kirk's vague order for a heading out there, thataway. DiFalco was played by Marcy Lafferty.