In a secret underground laboratory, Dr. Sebastian Caine (Kevin Bacon) and his team of scientists—including his former lover Linda McKay (Elisabeth Shue) and colleague Matt Kensington (Josh Brolin)—are on the verge of a breakthrough in invisibility technology. Funded by the Pentagon, they have already successfully rendered a gorilla invisible, though the challenge remains in reversing the process. The Experiment

As days turn into weeks, the psychological strain of invisibility begins to erode Caine’s morality. Initially, he uses his power for voyeurism, but his actions quickly escalate into violence and depravity. He stalks his neighbors and terrorizes his colleagues, fueled by a newfound sense of absolute power without accountability. According to director Paul Verhoeven, it is the state of invisibility itself—the freedom from being seen—that drives Caine's transformation into a killer.

Driven by ambition and a massive ego, Caine hides a successful reversal formula from the military and convinces his team to proceed with human testing—using himself as the subject. The initial serum works, breaking down his body "vein by vein, muscle by muscle" until he is completely transparent. However, the stable antidote fails to return him to his visible state, leaving him trapped in a literal "hollow" existence. Descent into Madness