Zs'Skayr was one of Ben's forms, freed from the Omnitrix. A copy of his evil personality was trapped within the Omnitrix when his DNA was sampled. He finally manages to force his way out of the Omnitrix in "Ghostfreaked Out" After peeling off the protective layer of skin that normally covers him, he tries to take over Ben's body in order to become whole again. After a failed attempt to possess Ben, he coerces Acid Breath, Thumbskull, and Frightwig to help him by taking over Thumbskull and tossing him about the room in a show of force. He is defeated when he is exposed to sunlight by Ben at the end of the episode, causing him to burst into flames. Following this, Ben never uses the form.

Ghostfreak is the main antagonist in the third season, returning in the two-part episode "The Return/Be Afraid of the Dark" where he is revived by an alien scientist named Dr. Vicktor. Gathering a group of horror-themed aliens as minions, Vicktor enacted a plan to resurrect Ghostfreak, whose master plan was to plunge the Earth into darkness. Ghostfreak himself is still intent on gaining control of the Omnitrix. Using corrodium retrieved by the mummy alien in "Under Wraps" they set up a Corrodium beam that will block out light from the sun, allowing Ghostfreak to exist in eternal darkness. Ghostfreak succeeds in doing so, allowing him to reach his full potential, but only for a while before Doctor Vicktor accidentally rammed Max into the Corrodium Projector during a dogfight. In the end, Ghostfreak is killed on board a space shuttle, when Max opens the shuttle's roof and exposes him directly to the sun. Ben regains use of the form during this time, except in Ghostfreak's natural state.

According to information from the Ben 10 week Marathon, Zs'Skayr was High Ecto-Lord of Anur Phaetos. He learned about the Omnitrix when one of Vilgax's data probes crash landed and he read its data files. Not long after, he met up with Myaxx when she was scouting the planet for DNA samples and aided her in acquiring samples from the nearby planet of Flors Verdance. However, Zs'Skayr possessed the Florauna Myaxx was sampling and used his powers to allow his DNA to enter the Omnitrix along with the sample.

Zs'Skayr returns in Season 3 of Ben 10 Alien Force in the episode Ghost Town. Imprisoned in a high security facility built especially to hold him alone, he is released by Vilgax. Vilgax makes Zs'Skayr tell him all the secrets of the Omnitrix in exchange for setting him free, but once free Zs'Skayr betrays him and creates an army of possessed people in Vilgaxia (Similar to its previous form in Ben 10). Vilgax has no other option but to seek assistance from his greatest enemy, Ben Tennyson. Vilgax, Ben, Gwen and Kevin travel to Vilgaxia in Ship to stop him. Ben is able to trick Ghostfreak into trying to possess his body and reabsorbs his DNA back into the Omnitrix, but Zs'Skayr takes control of Ben's body and plans to do the same with Vilgax. Gwen and Kevin try to stop Vilgax from attacking Ben to destroy Ghostfreak but are easily defeated. After nearly being possessed by Ghostfreak, Vilgax creates a flash of brilliant light with his sword, driving Zs'Skayr back and weakening his control enough for Ben to switch off the Omnitrix and return to normal. With Ghostfreak safely locked away inside the Omnitrix once more, Ben and his friends find Ship and head back to Earth.


Zs'Skayr has made three appearances in the Ben 10 Series.
Zs'Skayr (Omnitrix Alien) has made one appearance in the Ben 10 Series as a silhouette from the Omnitrix.

Zs'Skayr's First Appearance
Ghostfreaked Out

Zs'Skayr's Last Appearance
Ghost Town