When a young boy is murdered, a small Californian town becomes the scene of a mystery involving UFO sightings, terrifying supernatural forces, and a new girl in town. A few of the local children begin to understand that there's more going on than meets the eye as the story continues with the discovery of a portal to another world, a sinister monster, unnerving supernatural forces, and kung fu. Cosmic Girl is a love letter to the 1970s, a sci-fi adventure, and a horror story with a terrifyingly sinister monster.