Multiple realities(covers information from several alternate timelines)
Ensign Towles was a female operations division crewmember aboard the USS Enterprise-D in the late 2360s and early 2370s.
She was working in engineering while La Forge, Captain Picard, and Dr. Crusher identified the DNA fragments found in Professor Richard Galen's number blocks. (TNG: "The Chase")
She served as relief ops officer during the absence of Lieutenant Commander Data in late 2369. Due to temporal fragments she was like the rest of the crew frozen in time. (TNG: "Timescape")
When most of the ship's crew searched a planet in the Delta Quadrant for Data and the rogue Borg Crosis, Towles and Darien Wallace were assigned to man the command post. (TNG: "Descent")
In an alternate quantum reality experienced by Lieutenant Worf following his contact with a quantum fissure, Towles was one of the crewmembers who scanned the shuttlecraft Fermi after Worf reported that something was wrong. (TNG: "Parallels")
Ensign Towles was played by recurring background actress Kathy who received no credit for her appearances.
She was identified by name in the episode "Descent" and named after script typist Daryl Towles