Dr. Ivo "Eggman" Robotnik is the main villain from the Sonic the Hedgehog video game franchise. He is an obese scientist with an IQ of 300 who dreams of dominating the world with his empire of robots. His plots are endlessly thwarted by Sonic the Hedgehog, his nemesis.
In the Christmas special spun off from the franchise, Sonic Christmas Blast, Robotnik fools the people of Robotropolis into believing that Santa Claus is retiring, and that he has been picked as Santa's replacement, named Robotnik Claus. As Santa's "replacement", Robotnik demands that all the children on Mobius give him presents for Christmas instead of the other way around. Later on, he orders his minions, Scratch and Grounder, to capture Sonic, as that would be the one Christmas present he wants more than anything, but they fail. At the end of the special, Robotnik is shown admiring his stolen Christmas presents when Sonic zips into his fortress and reclaims them. The special would notably mark the final time the character was voiced by the late blues singer Long John Baldry, who passed away in 2005.
The modern-day video game version of Dr. Eggman would don a Santa outfit in the one-shot YouTube short "Chao in Space" with the intent on stealing presents from Chao in a Chao Garden. However, his plans were thwarted by a sleepwalking Chao, who punches the bad doctor in the face, sending him over a cliff. His various grunts and laughs were done by his present day voice actor Mike Pollock.