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Dr. Alphys is a female, reptilian monster that lives in the lab in western Hotland. She is the incumbent Royal Scientist, a position she was awarded by Asgore after the disappearance of her predecessor.



Alphys is a yellow, reptilian monster of similar height to the protagonist. Her posture is somewhat hunched over. She has yellow scales, claws, and protruding teeth (which seem to vary between two and four depending which way she faces). Her feet have three toes while there's three fingers and a thumb on each of her hands. Her "hair" is designed into points facing the back of her head. She normally wears round glasses a white lab coat. Her glasses don't cover her eyelashes. 

However, she wears a polka dot dress on her date with the protagonist.


Alphys is a nerdy, shy recluse with a fondness for human anime and manga. She has crushes on multiple characters (some mild, others more serious), but struggles to communicate her feelings due to constantly stuttering.

Alphys is filled with guilt and insecurities about herself and her accomplishments. After she accidentally created the Amalgamates while experimenting with determination, she told nobody and became deeply depressed and remorseful.

Mew Mew Kissy Cutie (Alphys' Most favorite Anime)


Alphys is the Royal Scientist and the guide to the player throughout Hotland. She 'assists' the player throughout Mettaton's puzzles and The CORE, which are revealed during Mettaton EX's fight to be activated as part of a ruse for the player to judge Alphys as a hero.

In her career and research of the power of Determination, she accidentally creates the Amalgamates by injecting Determination into monsters to see if it could revive them from death. They ended up melting together and forming beings called the Amalgamates. During this time period, she injects Determination into one of the golden flowers of Asgore's garden. Flowey is born from one of these flowers because of Asriel's dust being spread over it.

In the True Pacifist Route, she decides to show her feelings for Undyne, and they start dating on the surface.

AUs Alphys appears in:

  • UnderFell
  • UnderSwap (role of Undyne)
  • OuterTale
  • SwapFell
  • Dusttale
  • Alphyne (Alphys/Undyne amalgamate)
  • FutureTale
  • HandPlates
  • UnderKeep
  • Alphys NEO
  • Deltarune
  • UnderTale Rho
  • ForeverTale
  • RolereVerse (role of Toriel)
  • UnderKeep
  • StoryShift
  • ReaperTale
  • DanceTale
  • Pokemon Trainer! Alphys
  • LittleTale
  • MafiaTale
  • UndyneTale
  • PapyrusTale
  • SansTale
  • FloweyTale
  • MettaTale
  • PapyTale
  • TwistedTale
  • StorySpin
  • StorySwap
  • CyberTale
  • Lab.Exe
  • Mechalphys
  • UnderTerror
  • IsleTale
  • CandyTale
  • OceanTale
  • UnderSail
  • QuantumTale
  • PoisonTale
  • AnotherTime
  • NegaTale
  • SCPtale
  • Inverted Fate
  • Alphys NEO
  • In Battle
  • The Simpsons: Holidays of Future Passed
  • Inverted Fate
  • Glutton Alphys
  • TerraFormed
  • UnderTale Corrupted Justice
  • UnderCross
  • ShiftedTale
  • PairSwitch
  • EverTale
  • Twisted Rotation
  • TaleTwist
  • Doused Flames
  • JumbledTale
  • Tale's End
  • UnderSwap: Super Sigma
  • Underswap MH
  • Switchtale: Flower Masquerade
  • TS!Underswap
  • Shifted Fate
  • PGB DeltaTale
  • OverTime
  • TuberTale
  • SherlockTale
  • Stomping Ground
  • BrawlTale: Reclaimed Realms
  • History Recast
  • Tantamount
  • Anecdote
  • Storyspin
  • Spinned Fate
  • Brotherhood
  • Terraformed
  • ChronicleTwist
  • UnderTale: Reshuffled
  • Slight Alteration
  • TwistPlot
  • NologicTale
  • JumbledTale
  • TurnedTables

(Fanon/Fan-made/Parodied/Fusion/Fanon ship children/OC Sanses go to this scroll below)


(MATURE AU Sanses/Pages with gore and violence/Scary AU Sanses/Pages with heavy/strong topics go here)

  • Horrortale
  • Undertomb
  • Underlust
  • TrueLab.EXE
  • FreakTale
  • UnderWorld
  • GoreTale
  • If Undertale Was Realistic
  • Under(her)tail
  • HELP_tale


  • Alphys is the only character of the main cast that cannot be directly killed by the protagonist.
  • Although she is never shown to die on screen, it is heavily implied that she has suicidal thoughts, ("That's where I met Alphys for the first time!! I was looking for cool swords, when I saw her... Uh, standing there, staring into the abyss. She looked pretty... Um... ... contemplative.")
  • If both/either Mettaton or is killed, she cannot be found by the surviving cast members with the exception of in an aborted Genocide Route playthrough.