Ghostfreak is a shadowy, phantom-like alien, and has a protoplasm that can change its density. This enables him to phase through matter and turn invisible at will. He may have only one eye, but he can position it anywhere on his body, but by using a track traced along his skin. His appearance can also bring fear in the hearts of criminals everywhere, and sometimes, even Ben is creeped out. Ghostfreak can also peel back his own skin, which reveals a horrifying mass of innards, but it has yet to be seen. Direct light and chemicals that can affect his body will nullify his invisibility and intangibility. He is also not meant for extreme combat.

Ghostfreak is an Ectonurite from the planet Anur Phaetos, with the true name of Zs'Skayr. He is a high-lord of the Ectonurites in his home planet.