A Kraylor woman who presents herself as a doctor on a humanitarian mission in the episode Nightingale, but is really part of a team testing a cloaking device.
Dayla appears in the Voyager episode Nightingale. Harry Kim, Seven of Nine and Neelix come to the aid of a damaged Kraylor ship under attack by the Annari, and its surviving passengers say they are carrying vaccines to their blockaded homeworld.
Dayla is introduced as a physician and becomes one of the people Kim relies on when he agrees to take command of the ship, which he names Nightingale.
Kim eventually learns that there are no vaccines. Dayla and her senior colleague Loken are scientists, and the real cargo is the prototype cloak itself. She is killed during the voyage, a loss that weighs on Kim as he decides whether to see the mission through.