Suspiria

From Memory Alpha, the free Star Trek reference.

Suspiria was the name of the Nacene entity that accompanied the Caretaker in looking after the Ocampa. She left the Caretaker's array in the 21st century taking several hundred Ocampa with her.

She has taken care of those Ocampa for 300 years, and had helped them to develop their psychokinetic abilities. They constructed a new array to live in while Suspiria resided in the plane called Exosia.

She encountered the USS Voyager in 2372 and ordered that Ocampa to fire upon Voyager, believing them to be responsible for her mate's death. Suspiria came aboard the ship, attacked several crewmembers and threatened to destroy the ship. Janeway attempted to explain that they had nothing to do with the death of the Caretaker, but Suspiria continued her plan of revenge. Kes attacked Tanis, the head of the Ocampa, with her psychic abilities, and Tanis' pain was transferred to Suspiria because of their mental link. Suspiria was incapacitated, and Janeway fired a toxin that subdued her. When they showed her mercy, she ceased her attack on Voyager, and left for Exosia and was not seen again. (VOY: "Cold Fire")

Suspiria was played by Lindsay Ridgeway. Her voice was provided by Majel Barrett.

Suspiria may have been named after the Dario Argento horror film of the same name.