All Dr. W.D. Gaster Related Theories Tier List Maker

All theories related to the character Dr. W.D. Gaster from Undertale. Theories both about Undertale and Deltarune.

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This template has 24 images and was last modified 12/08/2025.

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Not A Doubt In My Mind
Believe In It
Reluctantly Believe
Good But Don't Believe
Mid Theory
Bad Theory
Terrible Theory
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