Inspired by a real-life experience of director Josh Margolin's own grandmother, THELMA puts a clever spin on movies like MISSION: IMPOSSIBLE, shining the spotlight on an elderly grandmother as an unlikely action hero. With infectious humor, Margolin employs the familiar tropes of the action genre in hilarious, age-appropriate ways to tackle aging with agency. In the first leading film role of her 70-year career, Squibb portrays the strong-willed Thelma with grit and determination, demonstrating that she is more than capable of taking care of business - despite what her daughter Gail (Parker Posey), son-in-law Alan (Clark Gregg), or grandson Danny might believe.

Dandelion (Kiki Layne), a struggling but determined singer-songwriter in a downward spiral, reluctantly takes a last-ditch effort gig where she meets Casey (Thomas Doherty), a guitarist who walked away from his dream long ago. As Dandelion joins Casey's eclectic and nomadic group of struggling musicians, the two kindred spirits make music together and strike up an intoxicating whirlwind romance that leads Dandelion to a deeper appreciation of her artistic journey and the discovery of a voice that is authentically her own.