Judge Q was an adjudicator of the Q Continuum, who had the ability to control the powers and lives of any Q within the continuum, ranging from removing their powers to changing their form.
In 2378, Judge Q determined the future of Q's son, Q Junior, after he underwent testing by the crew of the USS Voyager, following a streak of misbehaving and trouble making. After bumpy testing with problems and successes, Judge Q sentenced "Junior" to serve his life as a Human. This sentence was eventually changed by persuasion from Q, and his son's powers were restored. (VOY: "Q2")
Judge Q was played by Lorna Raver.