Seventeen Again

The Donovan family relocates from California to Connecticut, starting a new chapter in their lives. Sydney struggles with leaving old friends and adjusting to her father Barry's new marriage after her mother passed away. The move sets the stage for evolving family dynamics.

At her new school and in a new job, Sydney encounters Todd, a classmate she develops a crush on. Ashley, Todd's sister, dislikes her and criticizes her at every turn. The bullying adds to Sydney's sense of being an outsider in the new town.

Willie, a 12-year-old genius, tinkers in his home lab and dreams of beating aging. His father forbids further experiments until he learns responsibility. The family tensions rise as Willie's obsession grows.

In a lab accident, Willie spills some of his anti-aging formula on a box of soap. The mishap goes unaddressed as the family carries on with their routines. This set of events becomes the catalyst for the later transformations.

Cat uses the tainted soap and is transformed into a 17-year-old, and her ex-husband Gene undergoes the same reversal. They relive their youth and explore new possibilities while their real ages remain unchanged. The transformation carries serious implications for the family.

As teenagers, Cat and Gene enjoy their second shot at romance, but Willie realizes the formula may have deadly side effects. He understands there must be an antidote to restore them to their older, healthier selves.

In Sydney's room, Cat and Sydney share a heartfelt talk. Sydney admits she misses California and her old friends, while Cat opens up about her past with Ashley. The moment deepens their bond and mutual understanding.

Gene, having reflected on his life, decides to attend the school dance with Ashley as a gesture to reconcile with Cat. He hopes to mend their broken relationship and move forward together.

At the dance, Gene and Cat share a dance and begin to reconcile their relationship. Cat suddenly faints from the side effects of the transformation, creating a tense moment for everyone.

Willie arrives with the antidote while Gene carries Cat toward the pool for safety. Ashley, furious at losing Gene to Cat, tries to intervene, but Sydney stands up to her and punches her in defense.

Willie tosses the antidote into the pool, and Gene and Cat dive in to complete the transformation back to their true ages. The family relishes the restored balance and the budding reconciliation between Cat and Gene.

Barry and Monique return home to a stunned but happy scene as Cat and Gene recommit to each other. The couple discusses marriage again, while the family starts planning and supporting future moments together.

A call reveals that Barry is still near the dangerous soap in the shower, threatening a relapse. Sydney and Willie race to stop him before anyone else is affected, ensuring that the family remains safe and the moment of reform is preserved.