The Gg were an alien race from Star Control 2. They didn't like to engage in visual communications, so no one knows what they look like. The only race that knew of them in their time was the Burvixese. The Gg warned the Burvixese tht the Kohr-Ah located races by hyperwave broadcasts, then cut off all communications. The Gg were completely destroyed by the Kohr-Ah in 2142.