W.D. Gaster

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Dr. W.D. Gaster is a fictional character from the 2015 video game Undertale, created by game developer Toby Fox. In the game's lore, Gaster was Alphys's predecessor as the Royal Scientist for the Underground's kingdom of monsters. He was said to have created the Core in Hotland, which converts geothermal energy into magical electricity for use in the underground. However, he one day vanished without a trace, and was said to have been "shattered across time and space". He cannot normally be encountered in the game, and is never discussed directly as part of the game's main narrative. Players can only encounter events related to Gaster under a specific RNG condition called the "fun" value or by modifying the game files. A sprite from one of these events, internally named "Mystery Man", is generally used by fans to portray Gaster, though the sprite's connection to the character is not yet fully confirmed. The existence and nature of Gaster has been the subject of speculation among both fans...

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