Richard "Richie" Rich Jr. is not just any kid; he is the wealthiest child in the world, boasting a jaw-dropping fortune of $70,000,000,001 thanks to his father, the acclaimed Imagineer and philanthropist, Richard Rich Sr.. Despite this vast wealth, Richie, portrayed by Macaulay Culkin, finds himself isolated and longing for friendship, as he lacks peers his age. His only companion, the devoted butler Herbert Cadbury, often assists Richie as he navigates his lonely life.
Richie believes he may finally find camaraderie when he attends the reopening of the United Tool factory, a business recently acquired by his father with plans for modernization and worker distribution. However, his hopes are dashed when Ferguson, the overly diligent security chief, intervenes and harshly pulls him away from a group of children playing baseball. Fortunately, Cadbury advises Ferguson to handle Richie with care, recognizing the boy's heartfelt desire for companionship.
In an effort to bridge the distance caused by his father’s busy schedule, Richard Sr. has Professor Keenbean create the innovative "Dadlink," a device that allows Richie to communicate with his father anytime—though Richie's happiness is threatened by the scheming CFO, Laurence Van Dough. Van Dough has a nefarious plan to steal the Rich family's extensive fortune, with a plot that involves sabotaging the family's plane en route to England by hiding a bomb among their gifts to Queen Elizabeth II.
As tragedy strikes when the bomb detonates, sinking the plane, both Richard Sr. and his wife, Regina, manage to survive but are believed dead by Van Dough. Seizing the opportunity, Van Dough seizes control of Rich Industries, slashing charitable contributions and shutting down the United Tool factory, which directly affects the livelihoods of the sandlot kids Richie has come to cherish. This turn of events inspires Richie to confront his family's usurper and reclaim his family's honor and heritage.
The frail but brave Richie is soon aided by Cadbury, who, framed for murder and cut off from the outside world by Van Dough, remains determined to protect the boy. Drawing on his resourcefulness, Richie rallies his new friends and initiates a daring plan to break Cadbury out of confinement while maintaining a connection with Keenbean, who is working tirelessly to thwart Van Dough’s sinister designs.
As the tension escalates, Van Dough captures Keenbean, threatening his life to gain access to the Rich family vault. The plot thickens as Richie uses the Dadlink to uncover that his parents are still alive, spurring him into action. With a little luck and a lot of ingenuity, Richie and his friends orchestrate a rescue plan amidst a flurry of excitement and surprises.
The climactic confrontation leads them to Mount Richmore, where the vault is hidden. Van Dough’s greed is utterly shattered when he discovers that it contains not gold or riches, but the Rich family's treasured memories. In a critical moment, Richie bravely defends his parents from Van Dough, who attempts to shoot him amidst the chaos. Luckily, Richie’s outfit—accidentally transformed into something bulletproof by Keenbean's invention—protects him, allowing his family to escape unharmed.
The thrilling chase culminates with a showdown where Cadbury disables Van Dough with a well-placed shot, ultimately leading to the villain's arrest. In the aftermath, with order restored and his family intact, Richie embraces the joy of friendship, playing baseball with his newfound friends on the expansive grounds of Rich Manor, with Cadbury coaching and Keenbean officiating—proving that even a millionaire can find happiness in simple joys.
