Cloudbase is the operational headquarters of international security organisation Spectrum, from Captain Scarlet And The Mysterons. In the New Captain Scarlet series, it is called Skybase. Originally conceived as a security organisation, Spectrum needed an HQ that could be top-secret yet easily accessible to its operatives. Early designs for a submarine, a space station, a floating island, and a Saharan complex were rejected. Ultimately, plans were approved for an aircraft carrier-like structure that was able to float on the edge of Earth's atmosphere using a combination of turbo fans and newly-developed anti-gravity technology.