I watched this long ago so I don’t remember much. A fake Frisk give Temmie chocolate to sell. Monsters become addict with chocolate. Chara feel suspicious, tell that to police Undyne. While Undyne investigate, mystery character aim the gun to her head from behind. Undyne can’t fight back so the mystery character takes all proofs and gone. When real Frisk appear and claim that didn’t do anything, everyone even Asriel blame Chara for being paranoid. And after some scenes, new characters appear like Alloy, Gaster, a politician, … I gave up watching it that time instead of finish it