An aging NSA agent who's targeted for death when he tries to retire discovers his assassin is a younger cloned version of himself.

In Gemini Man, aging government assassin Henry Brogan (Will Smith) becomes the target of a highly skilled assassin who turns out to be a younger clone of himself. The clone, known as "Junior," was genetically engineered as part of a secret experiment.

As Henry confronts his own past and identity, he teams up with an ally, Danny Zakarweski (Mary Elizabeth Winstead), to uncover the truth behind the cloning program. The film explores themes of identity, nature versus nurture, and the ethical implications of genetic engineering, culminating in an action-packed confrontation between Henry and his younger clone.