Chara finally takes control. Sans's eyes glow red. Chara knows who they want to kill first. The only monster who could still be a threat, Undyne. Chara uses one of Sans's shortcuts to Undyne house. Undyne is lifting weights, and doesn't notice Sans. Until Chara starts a FIGHT.

"Sans what are you doing? Undyne asks.

"It's me Undyne," Chara grins, "it's Chara. You should've listened, I could've saved everyone, but you refused. Now, to get you out of the way."

"Sans!" Undyne yells, "you have to stay with me! Think about those you care about!"

Sans thinks about his friends and family. He thinks about what he's fighting for. He remembers Gaster. He holds the soul. He regains control.

"How did you know that would help?" Sans asks.

Undyne sweats nervously. "Uhhhh..." she replies, "lucky guess?"

"Don't lie Undyne. You can trust me."

"Fine, I've dealt with whatever demon this is before. My LOVE is fifteen, and I've dealt with Chara for years."

"What?"

"Sans, I killed most of the kids who fell. Chara's been tempting me for years. They keep telling me to give Flowey the souls. They keep telling me there's more to Flowey than we know. However, I know how to resist them. Everything I hear Chara's voice, I think about my friends. Frisk, Alphys, you, and everyone else. When you hear Chara, remember what you're fighting for. Remember your loved ones. It's kept Chara quiet enough for years."

"Thanks Undyne. I gotta go. See ya! And don't mention this to anyone, especially Frisk."

"Sure thing Sans."

"Thanks. See ya!"

Sans takes a shortcut to his lab. He puts the soul in the device. He begins to activate it.

"Wait!" Chara cries.

Sans ignores them and thinks about his friends. "This is pointless," Chara continues, "Frisk is going to reset. If you really want to save Gaster, we need DETERMINATION. Gaster has to be the one to reset. It will restore him. You just gotta trust me."

"Why should I?" Sans asks.

"Listen, Sans, I know I've done terrible things. I know I have serious control issues, but Gaster is like family to me. He used to tutor me and Asreil. He was like an uncle. I just want to revive him. We just need more souls. He has to be the one to reset. Please, trust me."

Sans grins. "Yeah," he replies, "maybe you're right." He begins to walk away... "or maybe not!" Sans could the switch. Gaster finally forms. He sees Sans, and smiles...