Lucy (Scarlett Johansson) tells a story of a girl who is able to unlock 100% of her brain capacity with the help of powerful synthetic drug. She was suppose to just deliver the good which was implanted in her stomach but things took a turn when she was keep captive and was tortured by the captor. She meets up with Professor Norman (Morgan Freeman) to show the world what happen when you use 100% of your brain capacity.
TL;DR: Even Scar Jo can't help a shitty written movie. Save your cash and watch others.