In 2018, a new Great Dark Spot was discovered on Neptune, nearly identical in size and shape as the one observed by Voyager 2 in 1989. The spot is in the Northern Hemisphere and is drifting westward more slowly than the surrounding winds. Dark spots can only be identified in visible light, because of their strong absorption at blue wavelengths, and only the Hubble Space Telescope has sufficient spatial resolution to detect them. A search of global Hubble Neptune images from 2015 through 2017 reveals smaller clouds present at locations consistent with this storm, meaning, it may take many years to form. If so, it may originate from much deeper in the atmosphere than previously thought. Future computer simulations of Neptune's dark storms can be constrained by these new observations to teach us more about deep atmosphere conditions and processes on all the giant planets.