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* Physical appearance is incomplete.
The Amazing Krudsky is a simple stage magician who became a real one by absorbing the magic from Fairy Princess Willow, and yearned for more power by getting the Goblin Scepter of the Goblin King. In the end, he was taken back to the magic world by the Goblin King for torment as punishment for his crimes.
Krudsky is a short Caucasian male, balding, and overweight. He first wore a typical magician's outfit, and after gaining the magic of Fairy Princess Willow, he wore a purple and red sorcerer's outfit.
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The Amazing Krudsky had spent a lifetime in search of real magical power, studying every spell he found and speaking every incantation, but to no avail.
Scooby-Doo! and the Goblin King
While getting ready for his magic show at the Coolsville Halloween Carnival, he was accidentally splashed by Shaggy and Scooby-Doo, who were at the apple bobbing booth. He proceeded to insult them, leading to Shaggy and Scooby getting back at him by ruining his show and exposing his tricks.
Vowing revenge, Krudsky angrily stewed in his tent, and unknown to him, Fairy Princess Willow enters Krudsky's tent, where he secretly reveals his wishes to become a real magician. The fairy inadvertently causes Krudsky to notice an entry on the Goblin Scepter in a spell book. The Goblin Scepter can be combined with fairy magic to control Halloween. Taking this as a sign, Krudsky then gets an idea to obtain the scepter and rule the world with it.
The fairy decides to toy with him, but while flying, the fairy accidentally slams her small body against a metal chair, knocking her out; Krudsky then crushes her with his flyswatter. When he notices her cry of pain from being crushed, he sees that she is a real fairy, kidnaps her, and uses a spell to absorb her magical powers, becoming a real magician.
Later, Willow manages to escape, and hides in the magic shop of the kindly Mr. Gibbles. Krudsky tracks her down, captures the Princess, turns Gibbles into a rabbit, and steals various magical artifacts before leaving.
Later, Fred Jones, Daphne Blake, and Velma Dinkley observe Krudsky converses with the Goblin King through a mirror where the Goblin King reluctantly agrees to exchange his scepter for Princess Willow at midnight at a clock tower. The three decide to go the tower and set a trap for the Goblin King and Krudsky.
At the clock tower, Krudsky and the Goblin King are almost through with their trade when Fred, Daphne, and Velma release a trap and run off with the princess. But the trap only catches the Goblin King and Krudsky takes the scepter, turning himself into the new Goblin King.
After turning the Goblin King into a goose, Krudsky and his new goblin army corner Fred, Daphne, and Velma atop a ferris wheel, and he uses his powers to turn Fred into a vampire, Daphne into a witch and Velma into a werewolf respectively. At that moment, Scooby, Shaggy, and Jack O'Lantern arrive. Jack sacrifices himself to strip Krudsky of the staff which Scooby uses to break Krudsky's spells, restoring his friends and the Goblin King, to normal.
The Goblin King then takes Krudsky prisoner for his crimes and his treachery, telling him that he'll have plenty of time to "work on his act" before returning to the Halloween world.