Nagilum

The main antagonist of the series  Star Trek the next generation  episode  Where Silence Has Lease  he voiced by ??

History
Nagilum was a formless immortal being living outside the universe and could not be detected by Federation sensors. His intelligence was described as "vast", such as that at first Deanna Troi could not discern.

In 2365 he met Uss-Enterprise in the Morgan Quadrant and trapped the Enterprise in the black hole, meanwhile Dr. Pulaski saw Nagilum, to communicate it generated a human face. He began to interest himself in studying the death by killing the Haskell corporate entrepreneur to observe him and terrorized the Enterprise and his studio cost the lives of half Picardsi people and opposite by activating self-destruction and Nagilum fera the experiment.

In a final conversation with Picard, Nagilum revealed that he had learned everything he needed. He judged Humanity as aggressive and militant, obsessed with the inevitability of the inevitable and concluded that "as a species, we have no common ground." He agreed to Picard who perhaps shared the character of curiosity. (TNG: "where silence is leased")