[MONSTER KID]
Yo. Undyne told me to... stay away from you. She said you... You hurt alot of people... But, yo! That's not true, right?! Yo... Why won't you answer me?! A-... A-... And what's with that weird expression?! Oh... Oh man... Man, my h-heart's pounding right out of my chest! What would Undyne do?! Yo... Y-you'd b-better st-stop r-right where you are! 'Cause if you w-wanna hurt anyone else, you're... You're gonna have to get through me first, A-... A-

UNDYNE! You're... you're hurt!

[UNDYNE]
Hurt? I-it's nothing... Next time, listen when I tell you to leave, okay?

[MONSTER KID]
Undyne, I!-

[UNDYNE]
I'll take care of this! Get out of here!

Heh... Heh... It's nothing...

No... S-somehow, with just one hit... I'm already... already...

D-damnit... Papyrus... Alphys... Asgore... Just like that I-I failed you!...

No... My body... It feels like it's splitting apart!... Like any instant, I'll scatter into a million pieces!... But... Deep... Deep in my soul... There's a burning feeling I can't describe... A burning feeling that won't let me die! This isn't just about monsters anymore... Is it?! If you get past me, you'll... You'll destroy them all, won't you?!

Monsters... Humans... Everyone... Everyone's hopes... Everyone's dreams... Vanquished in an instant!

But I won't let you do that! Right now, everyone in the world! I can feel their hearts beating as one! And we all have ONE GOAL! To defeat YOU!
Human... No! Whatever you are! For the sake of the whole world, I, Undyne, will strike you down!

You're gonna have to try a little harder than that!

You spilled blood
You thought it easy
You thought it fun
Now I've found out
Now your reign of terror's done!

Families you've broken
The ones you left in tears
Their hopes and dreams
Empower this hero's spear!

There'll be no more pain
You won't kill again
Face a true hero
The blade of evil's bane

Our future is grim
The chance to survive is slim
But we don't live or die
Based on your whims!

Howling of the wind
Echoes of your sin
Sings of hopes and dreams
That one day might have been
Now I rise again
This will be your end
You will never break my determination!

Don't you dare
Give me that smile!
Time to say goodbye!
Fallen human child!

Time to repent, for all of your pain!
You will never see the light of day again!

Honoring those who have gone
Though you tried your best
We will carry on!

We will stand strong
Through hate and death!
We will rejoice
As you take your last breath!

There'll be no more pain
You won't kill again
Face a true hero
The blade of evil's bane
Our future is grim
The chance to survive is slim
But we don't live or die
Based on your whims!

Howling of the wind
Echoes of your sin
Sings of hopes and dreams
That one day might have been

Now I rise again
This will be your end
You will never break my DETERMINATION!

Everyone's
Hopes and dreams
Tonight they all
Rest on me

I'm the hero
And you're the bad guy!
And tonight
I refuse to die!

Protecting those who survived
So long as I fight
We will stay alive!

You are a beast
Who knows only to fight!
But I swear I shall bring victory tonight!

You killed me once
You won't do it again
Your path of destruction is done!

Though you struggle on
Here I still remain
While everyone's hearts beat as one!

You never thought our lives meant anything
Your life must mean nothing as well!

But we soldier on!
And our victory we'll sing
Kids like you should all burn in hell!

Real heroes fight
To defend what is right!
You fight for the sake of a game!

You're following
The path of genocide!
So a true hero stands in your way!

Damnit... So... Even that power... It wasn't enough?... Heh... Heheheh... If you... If you think I'm gonna give up hope... You're wrong... 'Cause I've... Got my friends behind me... Alphys told me she would watch me fight you... And if anything went wrong she would... Evacuate everyone... By now... She's called Asgore... And told him to absorb the six human souls... And with that power... This world will live on!