After Dark is one of the original color screen savers that was made available for the Mac. If you don't remember it, then you might remember Flying Toasters, or an aquarium of fish that swim around? After Dark X uses the built-in OS X screensaver engine, so you don't have to worry about your screensaver crashing your system anymore.
Version 1.0.1b fixes a problem reported by some users which caused the background edit screen in the NewFishX screensaver to display in Japanese, even when English was selected as the primary language.
Mac OS X 10.1.5 or later