Lucas Sinclair is a main character in the Netflix series Stranger Things, portrayed by actor Caleb McLaughlin, known for his loyal, rational, and sometimes skeptical personality as part of the core group of friends in Hawkins, Indiana. He is the older brother of Erica, a best friend to Mike, Dustin, and Will, and later becomes the boyfriend of Max Mayfield, helping the group fight supernatural threats like the Mind Flayer and Vecna. 