After a stranger from another reality crashes on her world, 10-year-old Pibby narrowly escapes a dark fate and learns that all of existence is under attack by an evil entity. Teaming up with the immortal warrior Cole Maverick, timid sidekick Alloy Boy, and feline villainess Melira, Pibby must learn how to overcome her own demons and what it means to be a hero. But with her closest friend twisted by the entity, she must also find a way to destroy the evil befalling everyone, but it isn't what it seems...