Dr. Brown is a fictional character from the popular film series Back to the Future. He is portrayed as an eccentric and brilliant scientist who invents a time machine using a modified DeLorean car. His character is known for his wild hair, quirky personality, and catchphrase, "Great Scott!" In the films, Dr. Brown serves as a mentor to the main character, Marty McFly. Together, they embark on various time-traveling adventures, facing challenges and altering events in the past and future. Dr. Brown's inventions and knowledge of time travel are central to the plot, making him a key figure in the series.