Wyatt Bernstein, a typical boy, longs for a brother to share fun experiences and provide male companionship at home, where he's surrounded by females. On his birthday, his family takes him to a Build-A-Bestie store, where he creates a boy-filled Bestie. Crash, his creation, comes to life, and Wyatt's dream finally comes true. As new brothers, Crash and Wyatt help each other navigate life, with Crash encouraging Wyatt to be more outgoing and Wyatt introducing Crash to the joys of childhood. Despite their differences, they always support each other.
Wyatt Bernstein, a kid with three sisters, builds a puppet named Crash, who c...