The main character Dennis, played by Simon Pegg, is a lovable but unmotivated loser who regrets abandoning his pregnant fiancée Libby, played by Thandie Newton, on their wedding day. Five years later, he finds out that Libby is dating a successful and confident American fitness trainer named Whit, played by Hank Azaria. Determined to prove his worth and win back Libby's heart, Dennis decides to run a marathon.
However, Dennis is overweight, out of shape, and inexperienced in long-distance running. To help him prepare for the race, he enlists the help of his best friend and landlord, a sarcastic and lazy gambler named Gordon, played by Dylan Moran. Together, they embark on a grueling training regimen that includes running, weightlifting, and avoiding temptation.
As Dennis's physical and emotional journey progresses, he faces various challenges and setbacks, such as a leg injury, a drunken night of gambling, and doubts about his own abilities. Meanwhile, Libby and Whit's relationship hits some turbulence, as they disagree about starting a family and moving to New York.
In the climactic final scene, Dennis competes in the London Marathon, surrounded by thousands of runners and spectators. With the support of Gordon, Libby, and her young son Jake, Dennis overcomes his physical and emotional obstacles and finishes the race, winning back not only Libby's heart but also his own self-respect.
Run, Fatboy, Run is a heartwarming romantic comedy that combines humor, drama, and inspirational themes of redemption, perseverance, and true love. Directed by David Schwimmer and written by Michael Ian Black and Simon Pegg, the film showcases the talents of a talented ensemble cast, including the late Harish Patel as Dennis's eccentric Indian landlord Mr. Ghoshdashtidar and Thandie Newton as a strong and sympathetic heroine who faces her own challenges.
