Dinosaur follows Nina (Ashley Storrie), an autistic woman in her 30s, who adores her life living with her sister and best friend Evie. However, when Evie rushes into an engagement after only six weeks and makes Nina her maid of honour, Nina is floored. Forced to reconcile with her sister’s impulsive decision, Nina grapples with what this new challenge means, leading to a surprising journey of self-discovery.