Scarlett Johansson Morgan Freeman
Lucy (Scarlett Johansson) is a 25-year-old American woman living and studying in Taiwan. She is tricked into working as a drug mule by her new boyfriend, whose employer, Mr. Jang, is a Korean mob boss and drug lord. Lucy delivers a briefcase to Mr. Jang containing a highly valuable synthetic drug called CPH4. After seeing her boyfriend shot and killed, she is captured. A bag of the drug is forcibly sewn into her abdomen and that of three other drug mules who will also transport the drug for sale in Europe. While Lucy is in captivity, one of her captors kicks her in the abdomen, breaking the bag and releasing a large quantity of the drug into her system. this allows her to reach high percentage of brain usage, eventually to 100%. She then reaches out to a professor of brain works (Morgan Freeman) to help her.