Season 2

Monsters have integrated well with the rest of the humans after arriving on the surface. However, the AMD director, Jessica Grey, remains untrustworthy of them. Frisk does his best to convince her that the two races can coexist.

Jessica begins her plan to get revenge on the Monsters for killing her daughter. Mettaton holds his first show on the surface, but things go horribly wrong.

After Frisk learns of Sans' death, Betty launches an attack across the city. To stop her, Gaster, Alphys, and Jessica act to destroy her.

Undyne fights Bete Noire with determination and justice after Gaster's plan fails. After Frisk and Asriel rescued some school residents, Frisk began to show his true colors and tell Asriel the truth.

Frisk prepares for his fight with Bete Noire while other people are in shelter.

Frisk makes a choice to save the timeline from collapsing.

Chara had an idea how to save Asriel, but had to return to where they first met. Gaster is still distraught because Sans won't survive due to his poor condition.

Bete Noire began attacking the arena, while Mettaton fought against her, Gaster, Jessica, Undyne and Ronan had to prepare for a bigger threat.

Chara confronts Asriel again, as Toriel and Asgore fight Bete in the arena. Papyrus and Sans head to the arena to assist, while Undyne tries to come to terms with her past actions.

Undyne deals with The Kumuzilla, Chara is locked in battle with a HATE-controlled Asriel, and the skeleton trio reunite for a final battle against Bete Noire.

Papyrus attempts to evacuate Gaster, as Chara and Asriel make their final stand against HATE. Meanwhile, Rave and Ronan face an unexpected threat of their own.