Fatal Theories @fataltheories - Tumblr Blog

Dr. Gaster is open for asks. RULES: - One topic per ask. - No NSFW.

#undertale #fatal theories #undertale au #ask blog #undertale ask blog #w.d. gaster

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Welcome back!

How you doing Gaster

#undertale #fatal theories #undertale au #ask blog #undertale ask blog #w.d. gaster

MAIN EVENT 1/?? Research notes: "I CANNOT YET BE SURE AS TO WHAT EXACTLY TRANSPIRED, IT WILL TAKE TIME TO PIECE TOGETHER WHAT BROUGHT ME HERE."

#undertale #fatal theories #undertale au #ask blog #undertale ask blog #w.d. gaster

BELOW THIS LINE LIES MATERIAL OF NON-CANONICITY.

HERE BE DRAGONS.

2 years. 750 days.

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*i inject someone random (your choice) with a syringe of pure brainrot*

Gaster now is privy to knowledge that he would rather not be.

#undertale #fatal theories #undertale au #ask blog #undertale ask blog #w.d. gaster #old ask that i felt like answering lol

Will you?

Yes.

No.

Voting ended onJul 24, 2025

This choice will impact the direction of the story.

#undertale #fatal theories #undertale au #ask blog #undertale ask blog

How’s everything, Doc?

#undertale #fatal theories #undertale au #ask blog #undertale ask blog #w.d. gaster

16 left.

#undertale #fatal theories #undertale au #w.d. gaster

anything older than this post is non-canon, unless explicitly referenced by newer material.

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Ooooh, so Flowey likes kittiiiiiies? I see you petting the lil baby. Maybe it’s because you're kinda like a cat yourself.

#fatal theories #undertale #undertale au #ask blog #undertale ask blog #flowey

(A Cat observes from close-by.)

(Well, it only resembled a cat, but certainly wasn’t biological, mentally, or emotionally one.)

(Anyhow, The Cat approached and sat near.)

(The Cat wished for head pats-)

(-And a simple answer to an even simpler questioned.)

What do you regret the most, friend?

#fatal theories #undertale #undertale au #ask blog #undertale ask blog #flowey #cajt

also asks are open, for anyone who didn't know, especially to the underblog lot because i missed y'all

okay ooc moment, but im deleting all the "system" stuff because i've once again fallen into the trap of overcomplicating things, so im deleting it, and we're gonna focus on the characters

TRANSCRIPT UNDER CUT

#fatal theories #undertale #undertale au #ask blog #undertale ask blog #flowey

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#fatal theories #undertale #undertale au

i am now realising that i may have severely overestimated yall when planning this

im probably going to have to throw out most of what i have planned because in hindsight i doubt any of you would get half of it :/

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