Tova Veer in 2373
Tova Veer was a Voth scientist. In 2373, he and Forra Gegen discovered the remains of a Human on a planet in the Nekrit Expanse, and then tracked the starship USS Voyager, in an attempt to prove the Distant Origin Theory, which he supported. He also wished to pursue Gegen's daughter romantically.
When they arrived on Voyager, he was discovered even though he was using a cloaking device. After being exposed, he shot Chakotay with a small dart that rendered him unconscious. Gegen left with Chakotay, but Veer was captured by Tuvok. He then lead Voyager to the Voth city ship.
During the trial of Gegen for heresy because of his theory, Veer, after being threatened by the Voth authorities, stated that Gegen's research was flawed and that the theory was incorrect. (VOY: "Distant Origin")