watch 01:56 The Loop (TV) Do you like this video? Play Sound Sperantium was the chemical that fuelled the imagination. It was harnessed by Ronan Sumners, who used it to power the teleportation system in New Port City. Sperantium was prevalent in children, who had more avid imaginations, but decreased with age. Humans possessed more sperantium than New Port City's native Gornt population. (PROSE: Gatecrashers) Retrieved from "https://tardis.fandom.com/wiki/Sperantium?oldid=2977074" Categories: Anatomy and physiology Imagination + cat Cancel Save Community content is available under CC-BY-SA unless otherwise noted.