Takar was a member of a Srivani team of scientists that secretly boarded the USS Voyager in 2374 to conduct experiments on its crew.
When Captain Kathryn Janeway decided to end this situation and piloted Voyager into a binary pulsar, Takar appeared on the bridge and asked Captain Janeway about her intentions to destroy the starship and its crew. She told Janeway that the only reason was to intimidate the Srivani and her actions don't speak of rationality. Takar then tried to intervene but was unable to change the course on the conn station because the captain disabled all functions with her command authorization code. Takar threatened to kill the whole crew but Janeway didn't take her seriously.
Takar disappeared from the bridge and the two Srivani vessels left Voyager, although one was destroyed during the evacuation. (VOY: "Scientific Method")