In a flashback, Corrine Morgan-Thomas [Mary-Louise Parker] drives her seven-year-old twin boys Steven [Zac Efron] and Philip Morgan [Jeremy Shada] to a doctor’s office, where they learn they are autistic. Philip repeats what he hears others say (echolalia), while Steven remains completely nonverbal. After leaving the clinic in a highly distressed mood, Corrine takes the boys to a grocery store, a trip that quickly spirals as they scream through aisles and Steven wets himself, drawing stares from curious onlookers. The pressure of managing two autistic children proves overwhelming, and Corrine’s live-in boyfriend chooses to leave, recognizing the substantial challenges ahead in raising twins with a disability.
Corrine then moves with her boys to a new town and enrolls them in public school. There, classmates and teachers alike struggle to understand their unusual behavior, and a meeting with the principal and several psychiatrists leads to a tough verdict: they are not seen as fit for standard public schooling and are steered toward a specialized setting. The local mental hospital responds by sending a learning therapist to their home to build language skills and ready them for ordinary life. With this careful support, Philip’s vocabulary begins to expand, and Steven is able to speak his very first word:
> Pizza
Over the years, as the therapist moves on to work with other families in different cities, the brothers continue to grow. They flourish verbally, socially, and academically, though some autistic traits stubbornly linger: they still speak with nasal, almost robotic voices, sometimes engage in self-injurious habits, and remain highly sensitive to loud noises. An enduring fascination with Rocky from the Rocky films threads through their lives, offering a touchstone of shared joy amid the daily challenges.
On the first day of high school, Steven develops a crush on a girl named Jennifer [Alicia Morton], and the new social landscape brings both awkwardness and opportunity. A bathroom encounter with Philip gives Steven a chance to voice his feelings and his hopes, including a hopeful line about relationships: “Maybe she’ll be my girlfriend.” A boy older and more aggressive taunts Steven and shoves him, sparking a moment of fear and tears for both brothers.
Corrine is summoned by the school’s special education team and persuades the brothers to join the lunch routine. Jennifer sits with them, and Steven, drawn to the activity and the crowd, joins the cross‑country team. The school day unfolds with a mix of small triumphs and heartbreak: Steven discovers Jennifer kissing another boy, leaving him hurt and confused. Corrine discovers a love poem Steven wrote for Jennifer, and she helps him begin to accept that life will move forward even after a heartbreak. The emotional milestone follows: Steven wins his first race, proving his grit and determination, while Philip earns admission to a specialized music program by showcasing his guitar talent over the phone.
Inspired by their journey, Corrine establishes The Miracle Run Foundation to support research into autism, turning personal struggle into communal support and hope. The film closes on a note of resilience and progress, as Steven delivers a heartfelt speech about how his mother’s unwavering support and their family’s collective resilience shaped their lives with autism, and the credits celebrate the continued impact of their story.
