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In the CNAS-Tale sub-story 'CNAS' real origin' W. D. Gaster appears as the work partner of TheNitroFlamer and a main contribution to the creation of CNAS.
In this timeline Gaster appears as a tall skeleton with no hair, black eyes with white irises and two cracks running across his head. He wears a pale red turtleneck sweater, light brown pants held up by a rope belt and grey sneakers. While it is hard to see he also has holes in his hands.