Unnamed Bothans

Bothan infiltrator
The Bothan infiltrator attacked the crew of the USS Voyager in 2372. He neutralized almost the entire crew using an elaborate series of hallucinations which left them in catatonic states. The hallucinations were a product of the Bothan inflitrator's telepathy which he and others of his kind used to destroy any intruders in their space. He was disabled, when Kes was able to transmitt the hallucinations back to him. When uncovered, he vanished from the ship but not before telling Kathryn Janeway that he attacked them, just because he could.