The Invisible Woman

Dr. Dudley Plunkett, Bob Denver, a scientist at the Universal Biochemical Institute in Washington, D.C., conducts experiments in a lab filled with colorful containers and buzzing equipment. Two chimpanzees, Chuck and Yvette, watch closely as Chuck reaches through the cage bars and accidentally mixes a peculiar formula, which renders him invisible upon contact. Plunkett phones his niece, Sandy Martinson, Alexa Hamilton, a newspaper reporter chasing a story about art theft, and invites her to the lab with the enticing promise that a possible first byline—the tale of an invisible chimp—could be hers. When Sandy arrives, Chuck knocks over the invisibility liquid, and, in a panic, she ends up accidentally exposing herself to the liquid as well. The result is shocking: her body becomes unseen, and Sandy is overwhelmed by the realization that her life has suddenly been turned upside down.

The astonishment doesn’t end there. Plunkett quickly deduces a partial way to manage Sandy’s condition: with makeup, a wig, and sunglasses, she can pass for visible enough to function in public. This fragile arrangement allows her to return to work, where she secretly embraces her new ability as a tool for investigation. Her editor, Neil Gillmore, David Doyle, assigns her to probe another art-gallery theft, and Sandy decides to push her limits by going about her work while invisible—somewhat daring, undeniably risky. To get closer to the truth, she chooses to go nude, using her invisibility to slip through scenes that would otherwise be inaccessible. Her sleuthing leads her to a health club and a steamy room, where she eavesdrops on the thieves and discovers that the plot is masterminded by a wealthy philanthropist, Carlisle Edwards, Harvey Korman. Edwards has tasked two henchmen with stealing Cleopatra’s scepter, a priceless artifact rumored to carry a deadly curse. As Sandy watches from the shadows, the thieves sense an invisible observer and pursue her, forcing her to escape with quick thinking and careful movements.

Meanwhile, Plunkett makes a startling observation: Chuck appears to re-emerge, seemingly visible again as if the formula has worn off. He runs the numbers—time and weight—to predict when Sandy will vanish once more, and he plans to reveal his findings to his superior, Dr. Farrington, George Gobel, during a board meeting at the lab, with Sandy present at the moment she is due to reappear. Yet a twist of fate interrupts this plan: the boardroom is told that Chuck’s “empty” cage had actually been swapped for a different chimpanzee the day before, undermining Plunkett’s claim. Faced with the lack of real evidence, he is rebuked, and Sandy decides to keep her invisibility a secret so she can continue helping as a reporter without endangering the project.

With renewed resolve, Sandy informs the police about the impending heist, but authorities remain skeptical of a reporter’s unfounded tip. Undeterred, she ventures into the museum herself, invisible and bold, and uses a clever ruse—pretending to be the “curse of Cleopatra” to terrify the thieves. The criminals chase her into danger, and at one point she is knocked into a sarcophagus that closes around her. Plunkett arrives just in time to free her, but in the chaos the thieves seize the scepter and flee, kidnapping Sandy and using her as a hostage to evade law enforcement. They force her to drive their getaway car while police close in. In a tense turn, Sandy sheds her makeup, becomes invisible again, and adopts the persona of Cleopatra to derail the criminals’ plan. She convinces them to abandon their weapons and surrender, and the scepter is recovered. The culprits confess, naming Carlisle Edwards as their co-conspirator, who is subsequently arrested as well.

Back home, Sandy presents a front-page victory story to her colleagues—the headline reads “Museum Robbery Foiled.” However, Plunkett’s world shifts when he receives a dismissal letter from Dr. Farrington, threatening his chance to continue researching how to restore Sandy’s visibility. Sandy feels responsible for the potential setback and urges him to fight for his work. They return to the Institute and interrupt a board meeting led by Farrington. In a bold move, Sandy, still invisible, plays practical pranks on the board that mystify the scientists and demonstrate the real-world impact of invisibility. Her demonstration persuades Farrington to reinstate Plunkett, and the pair celebrate at the newspaper offices. A rival journalist arrives with the competing paper and asks why the “invisible woman” wasn’t seen earlier, prompting a witty exchange in which Plunkett jokes that it’s incredibly hard to spot someone who’s invisible, and the two share a toast to their unlikely victory and a new chapter for their teamwork.