Viktor

Doctor Vicktor (also known as Dr. Vicktor) is a Transylian from Anur Transyl. He worked at NASA to obtain the means to hijack a space shuttle. Despite his size, he possesses excellent reflexes, as he was able to quickly spin around and backhand a super-speeding XLR8 when the latter attempted a sneak attack on him. He is intelligent, and working for Zs'Skayr; his immediate plan was to resurrect his master, whose ultimate plan was to prevent the sun's light from reaching the earth using various satellites (therefore meaning that Zs'Skayr would be at full power all of the time). He is not treated with respect after Zs'Skayr is resurrected. After he asks why they need Ben, Zs'Skayr takes control of his body and throws him around. He serves as the unofficial leader of the three horror-themed aliens. The purple lightning that the previous two horror aliens appeared in was generated by a teleportation machine that he uses. His first appearance is in The Return, where he succeeds in resurrecting Ghostfreak. In the next episode Be Afraid of the Dark, Ben fights Doctor Vicktor and Zs'Skayr on Earth. Ben accidentally gains use of Doctor Vicktor's form when Vicktor finds Ben and grabs him by the wrist, unintentionally adding his DNA to the Omnitrix which gave Ben the alien he calls Benvicktor. Vicktor essentially defeats himself near the end of the episode. In an attempt to teleport Ben to an unspecified location, he and the mummy alien are tossed into the portal he created.

The video game Ben 10: Protector of Earth features "Vicktors" as enemies from Zs'Skayr's planet based on Dr. Vicktor.

It is explained that back when Zs'Skayr was still inside the Omnitrix, Ben used him to sneak into a horror movie, at which point he was overtaken by the alien, who contacted Doctor Vicktor with his plans then transformed back knowing nothing. He has super strength and can also manipulate electricity and he has high intellect.

Ultimate Alien
Dr. Vicktor is mentioned in Ben 10: Ultimate Alien after Alan became one of Kevin's victims and that he absorbed Dr. Vicktor's powers in Absolute Power: Part 1. Dr. Vicktor appears in the episode Viktor: The Spoils.

Original series

 * The Return
 * Be Afraid of the Dark

Ultimate Alien

 * Viktor: The Spoils

Trivia

 * Dr. Vicktor resembles "Frankenstein's monster". His name is derived from the name of Victor Frankenstein from the Mary Shelley novel.
 * Also, his electric powers seems to be based on Dr. Doom's powers from Marvel Comics, or perhaps the ideal of Frankenstein's monster being brought to life with lightning.
 * His species is the third most intelligent species in the universe, the first probably being the Galvan and the second the Cerebrocrustacean. It was this high intellect that allowed him to sneak into NASA.
 * In Absolute Power: Part 1, Alan Albright seems to mention Dr. Vicktor as one of Kevin's victims.