Jean-Luc Picard was the Captain of the Starship Enterprise in the second Star Trek series. No! that was different Starship Enterprise, not the same one that James T. Kirk commanded a generation before. Many treckies really liked Picard and were sorry when the series ended.
Jean-Luc Picard was a very good guy most of the time but for part of one terrifying story the Borg took Picard over and brainwashed him. Jean-Luc Picard recovered from this brainwashing, became a good guy again and opposed the Borg.