With his stately drawl, Morgan Freeman has narrated nonfiction documentaries about penguins, slavery, the lemurs of Madagascar, ancient Egyptian pharaohs, and the expansion of the universe. His is a voice of authority tempered by warmth and wisdom, capable of evoking felt human experience and the majesty of creation. In writer-director Luc Bessonโ€™s taut, fun Lucy, Freeman narrates several documentary sequences of soulful, unscientific horseshit about the human brain.

Itโ€™s not as if anyone will go all โ€œMythbustersโ€ on Lucy as Neil deGrasse Tyson does on Gravity, but itโ€™s fair to say that only people who actually use 10 percent of their brain capacity still believe that humans only use 10 percent of their brain capacity. But thatโ€™s the whole premise of Lucy, in which Besson classes up a pulp-superhero plot with half-understood evolutionary science and that old, smelly, percentage-based chestnut about brains.

None of that matters; it makes exactly as much sense as a radioactive spider bite or an overdose of gamma radiation. Bessonโ€™s film is about a woman who needs to find the meaning of life in a serious hurry. He opens Lucy with the image of a woman manipulated psychologically and physically by a man, who keeps grabbing her arm so she canโ€™t walk away; he concludes with the image of a woman who men literally canโ€™t touch.

Scarlett Johansson carries the film effortlessly, bridging Bessonโ€™s narrative and logical ellipses by fully embracing his crowd-pleasing intentions and convincingly depicting Lucyโ€™s psychological transformation. While Johansson is a high-status figure and a giant movie star, she lacks Maleficent-grade remoteness, alternating between accessible vulnerability and dispassionate violence without losing the audienceโ€™s empathy.

Probably because she only uses 10 percent of her brainโ€™s capacity, Lucy, an American student living in Taiwan, fails to recognize her new boyfriendโ€™s corn curlโ€“shaped cowboy hat as an obvious creep signifier. Bullied into delivering a mysterious briefcase to a Taiwanese syndicate boss (Choi Min-sik), sheโ€™s knocked unconscious and wakes up with a bag of an experimental drug sewn into her abdominal cavity.

Itโ€™s a synthetic version of a human growth factor and when the bag breaks open, the overdose stimulates Lucyโ€™s brain into an evolutionary process that heightens her senses and gifts her with superhuman powers of cognition and memory. Besson tracks her cognition meterโ€™s increase with title cards โ€” at 20 percent brain capacity, she can shoot around corners; at 30 percent, she can see through walls. Ultimately, she controls physics and matter with her mind. So thatโ€™s the mobโ€™s plan: to sell a transhumanism-inducing drug to club kids, which futurist Ray Kurzweil probably never saw coming. Chased by police and the mob, Lucy travels halfway around the world in pursuit of the other drug mules.

However gaudy and baroque Bessonโ€™s films can become, the director has a core of sincerity that drives (and sometimes overpowers) his films. Lucy, with her enhanced neurology burning brightly and quickly, becomes aware that the drug will kill her in 24 hours. Amid the filmโ€™s cross fire of revenge confrontations, shoot-outs, and gravity-flouting car chases, Besson includes a surprisingly poignant moment in which Lucy, whose personality is evaporating in the heat of her transformation, makes a sad, final telephone call to her mother.

In a hurry to find the meaning of life before the drug burns her up, she turns to Freemanโ€™s Professor Norman, a famous evolutionary biologist and stirring voice-over narrator. He tells her that the meaning of life may be to do what individual cells do: pass on their genetic knowledge to a new generation. This Promethean task becomes Lucyโ€™s quest and the filmโ€™s arc, which vectors toward an unexpectedly huge and cosmic finale โ€” one perhaps best explained in the warm, sonorous tones with which the best life-affirming, science-y bullshit is conveyed.

Chris Packham is a regular film contributor at Voice Media Group. VMG publications include Denver Westword, Miami New Times, Phoenix New Times, Dallas Observer, Houston Press and New Times Broward-Palm...