Lucy, portrayed by Scarlett Johansson, is a 25-year-old American studying in Taipei, Taiwan. Her life takes a drastic turn when she is deceived by her new boyfriend into becoming a drug mule for Mr. Jang, a ruthless Korean mob boss played by Min-sik Choi. Tasked with delivering a briefcase filled with a potent synthetic drug known as CPH4, Lucy's world spirals into chaos when she witnesses her boyfriend's murder. Captured by Jang's men, she suffers a horrific fate as a bag of the drug is forcibly implanted into her abdomen alongside three other unsuspecting mules.
The real twist comes when one of her captors assaults her, causing the bag to rupture. This improbable incident releases a massive amount of the drug into her system, triggering an unprecedented evolution of her physical and mental prowess. As she acquires extraordinary abilities such as telepathy, telekinesis, and the power to transcend pain, Lucy brutally dispatches her captors and makes her escape. Even after being shot, she shockingly removes the bullet herself, demonstrating her newfound power.
Determined to have the remaining drug extracted, she heads to the Tri-Service General Hospital, where an operation successfully removes the drug bag from her body. During the surgery, she learns about the dangers associated with CPH4 from the attending physician. Now equipped with the ability to hear thoughts and speak multiple languages, Lucy is no longer the same. She returns to confront Mr. Jang, eliminating his bodyguards and using her telepathic capabilities to extract information from him about the locations of the remaining mules.
In her apartment, Lucy dives into research on her radical transformation and reaches out to the brilliant scientist, Professor Samuel Norman, played by Morgan Freeman. His groundbreaking theories on the human brain suggest that as Lucy's capacity increases, she may uncover profound truths about existence, where he postulates that life serves two purposes: immortality or reproduction. The stakes rise as Lucy travels to Paris, evading the Taiwan police, and links up with local police captain Pierre Del Rio, who becomes her ally in recovering the remaining drug packets.
As they navigate through a tense series of events, bonding over their shared goal, Lucy discovers her debilitating state, which threatens her very existence. During a tense flight, a sip of champagne jeopardizes her cellular stability, compelling her to consume more CPH4 to stay alive. With her powers on an exponential rise, she overcomes armed threats and rivals from the Korean drug syndicate.
With Del Rio's assistance, Lucy successfully retrieves the drugs and arrives at Professor Norman's lab. There, she passionately expounds on the essence of life and time, culminating in a decision to absorb the remaining CPH4 bags through an intravenous injection. What follows is nothing short of extraordinary: her body morphs into a dark substance, enveloping the lab's equipment, transforming them into a next-generation supercomputer that embodies her vast knowledge.
In a breathtaking culmination, she transcends time itself, encountering the earliest known ancestor of humanity and sharing a profound moment of connection. Back in the lab, however, danger lurks as Mr. Jang arrives with lethal intentions. Just as he fires his weapon, Lucy reaches the pinnacle of her mental capacity, vanishing into the space-time continuum. In her absence, all that remains are her garments and the remarkable supercomputer she has created.
As Del Rio confronts the aftermath, he fatally shoots Mr. Jang, only to be left with a monolithic flash drive from Lucy’s transformation. When he questions Professor Norman about her whereabouts, he receives a chilling text message stating, “I AM EVERYWHERE.” With a sweeping view of the scene, Lucy’s voice resonates, echoing wisdom through time: “Life was given to us a billion years ago. Now you know what to do with it.”
