Widget, the World Watcher is an animated television series which debuted in syndication on September 29, 1990.The show focused on a 4-foot-tall (1.2 m), purple alien from the Horsehead Nebula named Widget who could shapeshift (usually by spinning like a top into different forms, in early episodes he seems to still be getting used to his power). He and a group of young, human friends; brothers, Kevin, Brian and their teenage sister Kristine, would go through a number of adventures to protect the natural environment from those who wish to plunder or harm it.
The series spawned two video games. Widget was released by Atlus on the NES in 1992 and Super Widget also by Atlus on the SNES in 1993.
Source: Wikipedia, "Widget (TV series)," available under the CC-BY-SA License.