After Gaster's defeat, Alphys evacuated Jessica and Gaster because she had a plan. However, it will fail because the weapon wasn't adapted to kill Betty because she isn't a human and neither a monster. Undyne will accidentally kill Alphys and be brutally speared until her determination saves her. This Battle involved Undyne and Betty.
Jessica and Gaster were returning from the plan's failure and Papyrus was healing Gaster.
Undyne asked for knowing what happened to Alphys, she runs in vain to save her life and killed her friend by Betty's mental manipulation. She (Undyne) was easily defeated until that her Determination saves her life.
In the first phase of the battle, Undyne easily assaulted and hurt Betty with everything that her Determination allows her to do, which resulted that Undyne had the upper hand and was nearly able to kill the pink demon even if she used her new weapon "Rhabdophobia".
In the second and final phase of the battle, Akumu decided to break the HATE vial and absorbed the black substance. The HATE acted like an enhancer and saved Betty from a possible death in the exchange of her mental sanity.
Later, Betty will retreat because the HATE was taking over her body. Undyne will fall by tiredness and cry after remembering that she killed her girlfriend.
|Human Soul Traits||DETERMINATION ♡ Justice ♡ Patience ♡ Perseverance ♡ Bravery ♡/FEAR ♡ Kindness ♡ Integrity|
|Souls||Monster Soul ♡ Human Soul|
|Weakened Souls||Grey Soul ♡ Empty Soul|
|Villains||Chara Dreemurr ♡ Bête Noire ♡ HATE ♡ Flowey the Flower ♡ Agate Lightvale ♡ Akumu ♡ Pink Blob(s)|
|Main Characters||Frisk ♡ Dr. Gaster ♡ Sans ♡ Asriel Dreemurr ♡ Undyne ♡ Papyrus ♡ Jessica Grey ♡ Toriel ♡ Asgore Dreemurr ♡ Dr. Alphys|
|Minor Characters||Amalgamates ♡ Mettaton ♡ Muffet ♡ Grillby ♡ Integrity|
|Side Characters||Amber Lightvale ♡ Cam ♡ Lily ♡ Robin ♡ Abigail ♡ Seth ♡ Zachary ♡ Hugo ♡ Ronan ♡|
|Background Characters||Temmie ♡ Burgerpants ♡ Jerry ♡|
|The Seven Wizards||Copper Lightvale ♡ Agate Lightvale ♡ Roy Goldburn ♡ Shane Goldburn ♡ Mila Rutrow ♡ Kody Fallenfire ♡ Rin Winterway|
|Season 1||Megalomaniac ◆ Yet Darker ◆ *Determination ◆ Your Best Friend ◆ Continue ◆ Glitchtale Season 1 Compilation|
|Season 2||My Sunshine ◆ Dust ◆ Do or Die ◆ Love ◆ My Promise|
|Miscellaneous||Sans vs Flowey ◆ Scared Of Me ◆ Snow Statues ◆ Flowey's Awakening ◆ Glitchtale Season 1 Abridged ◆ Don't forget... ◆ Cooking Lessons (Undertale Animatic) ◆ Glitchtale Official Denial Ending ◆ Glitchreel (Animation Reel 2017 Glitchtale Season 2) ◆|
|Glitchtale Origins||Glitchtale Origins... The Black Beast ◆|
|Pre-Glitchtale Battles||The Great Human and Monster wars ◆ Agate Lightvale vs Copper Lightvale ◆ Integrity vs Asgore ◆ Battle on The Corridor ◆|
|Season One Battles||Genocidal final battle ◆ Battle on The Void ◆ Battle on The True Lab ◆ Battle against to Megalomaniac ◆ Battle on The HATE Ball ◆|
|Season Two Battles||The AMD's trap ◆ Battle on The City ◆ First Battle on The Core ◆ Second Battle on The Core ◆ Battle on The Mountains ◆|
|Staff||Camila Cuevas ◆ NyxTheShield ◆ Strelok ◆ Veir ◆ Ruddles ◆|
|Vocal Talents||Courtney (Project_SNT) ◆ KateMarie999 ◆ Lumisau ◆ Zedrin ◆ MEMJ0123 ◆|