In industrial revolution London, an evil force looms across the dark streets, awakening a group of heroes dubbed Unicorn in the bodies of teenagers instead of the adult hosts they've embodied in the past.

With distorted memories and their magical abilities weakened and fragmented, the trio - powerful sorceress Melinda, cosmic monk Seng, and warrior elf Edred - must work together with help from their steam-powered robot, Copernicus, to uncover the mysteries of their past and present that will reveal their path to defeating a timeless threat.