Chapter Summaries

Murder and Killer fought Xx_FRESHSANS_xX, who forced them onto a dangerous skateboard course and attacked them with obstacles and Shock Waves. The battle continued after Murder discovered that cigarette smoke upset their enemy.

• Xx_FRESHSANS_xX revealed itself and used green magic to turn Murder and Killer's souls pale green and conjure skateboards beneath them.
• Murder fired his Shock Waves while Killer sent blade waves at Xx_FRESHSANS_xX, but it dodged and blocked their attacks as they rode through the course.
• Murder and Killer dodged the red liquid and reached the end of the course.
• Xx_FRESHSANS_xX summoned more Shock Waves and attacked, while Murder lit a cigarette and noticed its dislike of smoke.
• Killer asked whether Murder could smoke ten cigarettes at once, and he said that would be too dangerous.

Murder and Killer endured more skateboard challenges and shock-wave attacks while Xx_FRESHSANS_xX reacted badly to Murder’s cigars. The chapter ended as Xx_FRESHSANS_xX began cracking apart and warned them that seeing its true form would not be fun.

• Murder and Killer finished another skateboard course, then clashed with shock waves at the finish line.
• Murder lit a cigar, and Xx_FRESHSANS_xX trembled and complained about the smoke.
• Murder and Killer crossed another dangerous skateboard course through orange screens without serious harm.
• Killer saw the words “In this world... you only live once” and noted that she had lived more than once.
• Murder smoked two cigars at once, prompting Xx_FRESHSANS_xX to crack and warn them about its true form.

Murder and Killer defeated Xx_FRESHSANS_xX, then handed the box pendant to the human protagonist before leaving for another timeline. In Underswap, Cross attacked the pacifist-route humans, and Classic Sans and Fell Sans arrived to stop him.

• Xx_FRESHSANS_xX revealed an ugly bug-like true form, and Murder destroyed its soul and absorbed it into the box pendant.
• Murder and Killer returned to Snowdin and realized they might have taken something that belonged to the story's human protagonist.
• Killer gave the box pendant to the human, and she and Murder left through a spacetime rift to help another timeline.
• In Underswap, Cross wrecked buildings while Nightmare watched, and Swap Papyrus urged the humans to flee.
• Classic Sans and Fell Sans appeared and destroyed the falling rubble, while Cross turned toward them.

Murder and Killer tried to take a vacation in UnderSwap, but an explosion drew them toward a confrontation involving Blue, X-Chara, Swap Papyrus, and Nightmare. Blue fired her Shock Waves at X-Chara as Swap Papyrus rushed to protect him.

• Murder asked Killer why they were in UnderSwap, and Killer explained they had arrived on a peaceful route and should enjoy a vacation.
• Murder reflected on the peaceful world and his past before Killer urged him to rest ahead of their next timeline visit.
• An explosion that sounded like a Shock Waves blast interrupted them, so Murder and Killer entered a shortcut.
• Blue rode a charged Shock Waves while X-Chara stood in its firing line, smiling and displaying his soul.
• Nightmare told X-Chara to show Swap Papyrus the truth, and X-Chara's face transformed as he used Act to take control of Blue.
• Blue's Shock Waves fired at X-Chara, and Swap Papyrus lunged to save him while Nightmare spoke of her frozen pain.

Swap Papyrus tried to sacrifice herself, but Murder and Killer intervened to save her from X-Chara. Classic, Fell, and Dream also arrived, leaving the heroes stunned by Killer’s allegiance and the newcomers’ extraordinary Levels of Violence.

• Swap Papyrus blocked X-Chara’s attack and told Blue that she and Sans had no value left in their timeline and should disappear with what they had lost.
• Murder appeared and blocked X-Chara’s cleaver, then endured his attack and pinned him down with gravity.
• Killer joined Murder and stopped X-Chara’s purple slash, prompting Nightmare to realize she was still under his control.
• Dream arrived with Fell and Classic, and Dream reacted in shock when she recognized Killer as Nightmare’s former ally.
• Classic attacked X-Chara while his OverWrite was on cooldown and warned him never to let his guard down.

Classic Sans and the others attacked X-Chara, while X-Chara tried to persuade Classic to abandon Ink and return home. Nightmare rescued X-Chara and escaped with him after Murder saved Swap Chara from a tentacle strike.

• Classic Sans launched X-Chara into a barrage of bones, then pinned him down as the others attacked; Dream blasted Nightmare away when he intervened.
• X-Chara discussed timelines with Classic and urged him to leave Ink behind, while purple overwrite formed a cleaver in his hand.
• Killer's slashing waves cut through a tentacle Nightmare sent toward the group, but Nightmare announced they would leave and attacked Swap Chara.
• Murder hurled Swap Chara against a building to save her from being impaled, leaving her badly injured as Swap Papyrus and Blue rushed to help.
• Nightmare recovered, pulled the wounded X-Chara away, and X-Chara taunted Classic as they escaped.

The collapsing timeline forced Blue and the others to flee, leaving Swap Papyrus behind. After Ink disappeared again in the new timeline, Classic decided to search for her, while Fell stayed with the grieving Blue.

• Swap Papyrus told Blue to escape the collapsing timeline while she stayed behind with Chara.
• Killer failed to reset the timeline, and Dream opened a portal to a safer timeline.
• Fell pushed the frozen Ink through the portal, and Blue left Swap Papyrus behind in tears.
• In the new timeline, Classic asked Murder and Killer who they were, and they offered to help.
• Classic set out with Murder and Killer to look for Ink, while Fell stayed with Blue.

Classic, Murder, and Killer watched a meteor shower with Outer before a prank revealed that they were all Sans-like impostors. Outer agreed to help them search for someone who looked like them, but first asked about Murder and Killer.

• Classic tried to hide his face while Murder and Killer pointed out that the peaceful timeline was on a genocide route.
• Classic and Murder watched the meteor shower, and Murder told Classic that he had never seen a sky like it in his timeline.
• Outer approached the three and invited them to shake hands, leading to a whoopee-cushion prank.
• Classic asked Outer whether she had seen someone who looked like them, and Outer offered to help search during her break.
• Outer asked Classic what Murder and Killer were to him.

Outer, Classic, Murder, and Killer encountered a dangerous group while searching for someone, including a version of Killer from another point in her timeline. After the group was spotted, Killer fought off UV Killer’s attack and Murder teleported them to safety.

• Outer explained that he was helping his little sister pursue her goal of joining the Royal Guard, while Classic shared his envy of Outer’s view of the stars.
• The group found a Sans-like figure cutting down a monster, and Murder whispered to Killer that the figure looked like her.
• Killer recognized the figure as herself from an evil point in her timeline and identified the other people nearby, including Error String.
• Error String ordered his allies to catch the group, and blue threads surged toward them.
• Killer cut through the threads and blocked UV Killer’s dagger strike, then Murder grabbed her and teleported them away.

Murder and Killer escaped the battle after helping Blue, Fell, and Classic break free of the threads, then rested in a quiet Grillby’s. There, Insanity recognized Murder and asked him for help after recounting how she had fought a powerful human and fled Sanses recruiting for Nightmare.

• Killer decided that she and Murder would help Blue, Fell, and Classic once more before retreating from the overwhelming battle.
• Murder severed the threads controlling Blue, Fell, and Classic, and Killer held back the thread mass as the pair escaped through a spacetime rift.
• Murder and Killer rested at Grillby’s in an Undertale timeline and agreed they could not keep getting involved in such dangerous fights.
• Insanity approached Murder, recognized him by name, and explained that she had met another version of him before.
• Insanity described fighting a powerful human with a LV1 girl, being helped by ███, and fleeing Sanses who wanted her to work for Nightmare.
• Insanity asked Murder for help, admitting that she knew he was not the Murder she had met.

Insanity asked Murder and Killer to help her fight three Sanses who had been tracking her across the multiverse. Killer recognized them as members of Nightmare’s team and agreed to face them, leaving the group to prepare for their arrival.

• Killer woke to find Insanity beside her and, remembering their past fight, reacted in fright before reluctantly introducing herself.
• Insanity explained that a man named Bill Sans had sent her to people who could help, in exchange for placing a surveillance device on her.
• Insanity asked Murder and Killer to help her fight three Sanses who had pursued her and wanted to recruit or kill her.
• Insanity described the three pursuers, and Killer suspected they belonged to Nightmare’s team for spreading negative emotions across the multiverse.
• Killer agreed to help Insanity, and the group set out to find a suitable place to wait for the three Sanses.

The Bad Sanses confronted Insanity on the moon after Nightmare sent them to bring her in. As the six prepared to fight, Bill Sans watched through Insanity’s vision while Ink tried to learn what he was doing.

• Killer complained about Insanity, but Murder explained that Nightmare had ordered them to find her, and Horror said he only cared about getting enough to eat.
• Killer transported the trio to the moon, where they found Insanity waiting in a breathable, comfortable lunar environment.
• Insanity entered her combat form and challenged them, while uv!Murder and Murder discussed their different choices and the trio assigned opponents.
• Murder faced uv!Murder, Killer faced uv!Killer, and Insanity prepared to fight uv!Horror as all six summoned their weapons and magic.
• Bill Sans watched the confrontation through Insanity’s vision, and Ink approached him, but Bill refused to reveal what he was doing or make a deal.

Killer and uv!Killer fought to a stalemate while Murder battled uv!Murder with bones, Shock Waves, and magic. Their fight remained unresolved as uv!Murder blocked Murder’s attacks with his trident.

• Insanity charged at Horror, who retreated, while Murder used gravity magic to send uv!Murder to the right and followed him.
• Killer and uv!Killer traded knife attacks, but their matching habits kept either from finding an opening.
• Murder used Blue Bones and Shock Waves against uv!Murder, who countered with his own Shock Waves and Purple Bones.
• uv!Murder blinded Murder with a veil of light and attacked with fireballs, but Murder dodged by instinct and regained his sight.
• Murder dodged uv!Murder’s bone spears and harassed him with bones, which uv!Murder blocked with his trident.

Insanity overwhelmed Horror with her speed and reflexes, knocking him unconscious after he tried to hold her off. She then charged toward Killer.

• Horror blocked Insanity's attacks with his meat cleaver and raised bone walls to keep her back.
• Horror used Shortcut to attack Insanity from above, but she dodged his slash and kicked him.
• Horror defended against Insanity's rapid punches as she charged Shock Waves.
• Insanity flashed behind Horror and struck the base of his neck with a bone, knocking him unconscious.
• Insanity ignored Horror and charged toward Killer.

Murder outmaneuvered uv!Murder in their fight, using feints and delayed Blue Bones to trap him. uv!Murder broke free and prepared to continue the battle.

• Murder dodged uv!Murder's trident strikes, then sent him flying with an elbow.
• uv!Murder blocked Murder's approach with flames and summoned Shock Waves cannons.
• Murder tricked uv!Murder with bone fragments, slipped behind him, and placed delayed Blue Bones beneath his feet.
• Murder summoned a massive Shock Waves cannon, but uv!Murder's cannons locked on and fired at him.
• Murder dodged the blasts with a leap and double jump, while uv!Murder escaped the Blue Bones.
• Murder and uv!Murder exchanged remarks about a human beating uv!Murder, then prepared to continue fighting.

uv!Killer fought Insanity and Killer but knocked herself unconscious to survive, leaving one opponent. Murder and uv!Murder continued their stalemate as uv!Murder said her partners would capture Insanity.

• uv!Killer asked Insanity to listen to her, but Insanity charged at her instead.
• Killer cheered Insanity on while she fought uv!Killer, whose blades and attacks failed to stop Insanity.
• Killer paused twice when uv!Killer called for a stop, then uv!Killer knocked herself unconscious with a summoned bone.
• Insanity looked down at uv!Killer and said one opponent remained.
• Murder and uv!Murder traded ineffective attacks, and uv!Murder said her partners would take Insanity away without killing her.
• Murder questioned whether uv!Murder's team was stronger, and uv!Murder said she believed in them.

Killer and Insanity freed Murder from the Tracker, but Nightmare appeared and attacked them. With the three trapped and outmatched, ███ told Murder how to summon a deal-making stranger.

• Killer tied up Murder and the other two Bad Sanses, and Insanity snapped the Tracker in half.
• Nightmare appeared and attacked Killer, Insanity, and Murder with his tentacles.
• Killer failed to open a Space-Time Rift, while Nightmare's tentacles steadily squeezed the space around them.
• ███ told Murder that a deal with a strange man in black and yellow was their only chance to survive.
• ███ instructed Murder to repeat the words needed to summon the man.

Murder summoned Bill Sans while Killer and Insanity defended him from the tentacles. Bill Sans sent the Bad Sanses to another parallel spacetime in exchange for a future feast, and the group prepared to reset Insanity’s spacetime.

• Murder recited an incantation while Killer and Insanity fought off the tentacles to protect him.
• Murder’s eyes glowed blue, the world slowed, and Bill Sans appeared in golden flames.
• Bill Sans offered to hide the Bad Sanses in another parallel spacetime in exchange for a deal, and Murder shook his hand.
• Bill Sans sent the four members of the Bad Sanses away and said they would attend his feast in the future.
• Murder, Killer, and Insanity acknowledged that they had signed their lives away, then agreed to reset Insanity’s spacetime together.

Insanity decided to leave her timeline and join Killer and Murder in seeking redemption. ULB woke in a peaceful Underground to find two other versions of herself in the corridor.

• Insanity said she would not reset her timeline because its humans were gone, and she wanted to help Killer and Murder make amends.
• Killer welcomed Insanity to the group, and the three crossed a rift in spacetime together.
• In the void, ███ reconsidered Bill Sans and began drawing up a new blueprint.
• ULB slept at the sentry station while Papyrus called out to her, then woke to find two other versions of herself in the corridor.

Murder, Killer, and Insanity fled lustful monsters in a strange new world until they met Lust, a Sans from that timeline. Lust recognized them as Multiverse counterparts and introduced himself by name.

• Killer dragged Murder through Snowdin to escape monsters, then hid with him as Insanity joined them after scouting other areas.
• Murder recalled that some monsters had offered Killer money and chased her, even after she returned it.
• The three discussed finding a guide, and Lust approached them in a dark alley.
• Murder introduced himself, Killer, and Insanity as Sans counterparts from the Multiverse.
• Lust confirmed they were versions of him and asked them to call him Lust.