Ghostfreak

Zs'Skayr was the Ectonurite High Ecto-Lord of Anur Phaetos. He originally was stuck in the form of Ghostfreak, but after time managed to gain control over it and escape the Omnitrix, becoming one of Ben Tennyson's most dangerous enemies.

AppearanceEdit
In the original series, he had a gray body and black nails. However, in Alien Force, he had a purple body, white nails and spines sticking out of his back.

HistoryEdit
The original 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, unknown by Myaxx, Zs'Skayr possessed the Florauna that was being sampled and thus Myaxx then got a Ectonurite-Flouarana hybrid sample. Zs'Skayr's personality lay dormant within the Codon Stream, as Ectonurites' personalities are tied to their DNA. The real Zs'Skayr has died sometime between then and the original series and a genetic clone was created in full power. He now has super strength.

Original seriesEdit
His mind lay within the DNA sample of Ghostfreak. He finally managed to force his way out of the Omnitrix in the episode Ghostfreaked Out. After peeling off the protective layer of skin that normally covered him, he tried to take over Ben's body in order to become whole again. After a failed attempt to possess Ben, he found the Circus Freak Trio (whom were attempting to steal gold trophies from where Ben was at merely minutes before freeing himself) and coerced them to help him by taking over Thumbskull and tossing him about like a ragdoll in the room the three of them were hiding in. He was defeated when he was exposed to sunlight by Ben, causing him to burst into flames. Following this, Ben was unable (and unwilling) to turn into Ghostfreak again.

Zs'Skayr is the main antagonist in the third season, returning in the two-part episode The Return and Be Afraid of the Dark where he is revived by an alien scientist named Dr. Vicktor, a Transylian from the Anur System that had stolen material from Zs'Skayrs' clocktower grave to re-animate his deceased master again. Gathering a group of horror-themed aliens as minions, Vicktor enacted his plan to resurrect Zs'Skayr, whose then planned to plunge the Earth into total darkness for him to control. Zs'Skayr 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 Viktor accidentally rammed Max Tennyson into the projector during a dogfight. In the end, Ghostfreak is killed on board a space shuttle, when Max opened the shuttle's roof and exposes him directly to the sun. Ben regains use of the form during this time, except in the Ectonurites' natural state.

Ben 10: Alien ForceEdit
Zs'Skayr reappeared in Ghost Town. After being removed from the Codon Stream, Zs'Skayr had apparently been imprisoned by the Galvans. Vilgax frees him on the condition that he tell him the secrets of the Omnitrix and the knowledge to defeat Ben, but Zs'Skayr betrays him and takes over Vilgax's home planet of Vilgaxia, possessing the citizens and turning them into his minions that resemble his sun shielded form. Vilgax then enlists the help of Ben, Gwen and Kevin to try to take Vilgaxia back. During the battle, Ben lets Zs'Skayr enter his body, returning the Ectonurite DNA to the Codon Stream. Ben transforms into Ghostfreak but the alien soon takes control of him and soon he tries to possess Vilgax, but is defeated by the light of Vilgax's sword and Ben changes back. He is now back in the Omnitrix. He also appears in the Vilgax Attacks Video Game as the Boss of his Home planet Anur Phetos.

Role in Ultima
In Ultima, Ghostfreak has been recruited by the Organization to join them as a General of the Ghost and Phantom sections of the Grand Army.