At a cocktail party hosted by a Washington
think tank, scientist Devin Villiers is violently abducted by an unseen force into a bathroom. Under duress, Devin discloses the existence of Maggie Dalton, a fellow scientist who possesses crucial knowledge referred to as the "formula" sought by the invisible assailant. The assailant spares Devin's life with a warning not to divulge the incident, but soon after, Devin attempts to alert others and is fatally attacked. In response to the escalating threat against Maggie Dalton, Dr. William Reisner, owner of the laboratory involved in the invisibility experiment, hires detectives Frank Turner and Lisa Martinez for her protection. Despite their efforts, the invisible assailant manages to infiltrate Maggie's residence, resulting in Lisa's tragic death. Although military forces are deployed to apprehend the invisible man, their efforts prove futile. Maggie is subsequently placed under protective custody, but Turner aids in her escape upon discovering plans to transfer her into military custody. Maggie reveals that years earlier, scientists had developed a serum for achieving invisibility, which had severe and ultimately fatal side effects. Following the project's covert resurrection by the military, Michael Griffin volunteered as a test subject. However, the antidote intended to counteract the serum's effects failed, leading to Griffin's presumed demise. Later Maggie becomes aware that the buffer was never actually administered. Turner and Maggie seek refuge with Laurents, a former soldier involved in the program, who discloses that Griffin has been exploited by military authorities to carry out political assassinations. Griffin tracks down Ludlow and attacks him, and Ludlow sacrifices himself to save Turner and Maggie. Griffin abducts Maggie's sister, and contacts Maggie to recreate the antidote in exchange for her sister's life. He decides to meet on a train station, prompting a confrontation with Turner, who employs invisibility to engage Griffin in combat. Meanwhile Griffin drags Maggie to a lab for the buffer (antidote), where he asks her to inject half the buffer in herself, to be sure its safe for him. Turner follows them and a fight between both ensues. Griffin starts to become visible and badly scarred, revealing Maggie had put rat poison instead of the antidote. Turner takes Maggie to the hospital and vanishes. With Griffin defeated, Maggie and Turner emerge victorious, but emotionally scarred from their harrowing ordeal. ==Cast==