The first journey of the U.S.S. Enterprize, NCC-1701-D, was seriously disrupted by the appearance of a being called Q. Q said that humans are extreme barbarics and brought Captain Picard on trail to prove the opposite. Q is immortal and powerful, he shows a horrible posture to vulnerable, mortal lifeforms. Q threatened the crew of the Enterprise for 7 years, during that period his threatening and bragging became a game to him and he became less dangerous. When the Q judged that the human race should be removed from the universe it was Q that helped picard to solve the mystery and prevented the destruction of humanity.