Season 4 · Episode 3
Dr. STONE: Light Trap in the Darknesswatch all episodes online
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Light Trap in the Darkness
- Season 4 · Episode 3
- 24 min
The Perseus lands in the Americas. They first head to Northern California in search of yellow dent corn, but discover a lot more than that.
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Watch Dr. STONE online free on this page: the official trailer in HD, the player and a page for every episode, with no sign-up and no subscription. Dr. STONE (2019–2026, animation, action & adventure, comedy, sci-fi & fantasy) has 4 seasons and 94 episodes; below you'll find the plot and the voice cast. It is part of our collections: Best Shonen Anime, Sci-Fi & Cyberpunk Anime. Episodes can't be downloaded here and there are no torrents — the page is for watching online only.
Episodes
37 episodes · 2025
1✓ WatchedStone WorldSeveral thousand years after a mysterious phenomenon turns all of humanity to stone, the extraordinarily intelligent, science-driven boy, Senku Ishigami, awakens from petrification. Facing a world of stone and the total collapse of civilization, Senku makes up his mind to use science to rebuild the world. Starting with his super strong childhood friend Taiju Oki, who awakened at the same time, they will begin to rebuild civilization from nothing. Depicting two million years of scientific history from the Stone Age to present day, the unprecedented crafting adventure story is about to begin.
2✓ WatchedKing of the Stone WorldFacing immediate danger from wild animals Senku and Taiju are forced to revive Tsukasa Shishio "The Strongest High School Primate". Although Tsukasa has tremendous fighting ability and provides abundant food as their hunter, their new ally harbors an opposing view on restoring humanity.
3✓ WatchedWeapons of ScienceSenku does not trust the motivation of Shishio, so he will try to hide his plans from a new and unforeseen enemy for his plan to revive civilization.
4✓ WatchedFire the Smoke SignalSenku has the idea of creating gunpowder to have a way to balance the scale and have a chance to defeat Shishio. The production of gunpowder causes a fire. Shortly thereafter, Senku and the others discover smoke signals on the horizon. An accident? Hardly likely. Apparently there are other people in the stone world ...
5✓ WatchedStone World The BeginningShishio is determined to end Senku's life if he does not promise at that moment that he will abandon his idea of recovering civilization as it was before the incident.
6✓ WatchedTwo Nations of the Stone WorldTaiju and Yuzuriha figure out Senku's secret to reviving him. But now that he's back, they need to deal with Tsukasa.
7✓ WatchedWhere Two Million Years Have GoneKohaku shows Senku to her village, but it's going to take some convincing before they let him in. In the meantime, he makes friends with a like-minded, promising "sorcerer."
8✓ WatchedStone RoadKohaku's sister, village priestess Ruri, is gravely ill. Senku, Chrome and Kohaku begin their quest to make antibiotics to save her life.
9✓ WatchedLet There Be the Light of ScienceSenku starts a ramen stand in hopes of winning over support for his kingdom of science, but some people are too principled to take such a bribe. Mentalist Asagiri Gen is not one of them.
10✓ WatchedA Flimsy AllianceSenku and his kingdom of science successfully test the first lightbulb since the collapse. Meanwhile, Asagiri Gen, a spy from Tsukasa's empire, is killed by an unknown attacker.
11✓ WatchedClear WorldThe development of glassworks, an important step for making sulfa drugs and for chemistry as a whole, turns out to have a surprising benefit for Suika.
12✓ WatchedBuddies Back to BackTo make antibiotics, Senku and his kingdom need to obtain sulfuric acid from a fountain of the stuff. The team goes prepared, but there's no guarantee that they'll make it back alive.
13✓ WatchedMasked WarriorAll that's needed to make antibiotics is alcohol. The best way to get some is to win the Grand Bout, which the Senku and his kingdom will also need to do in order to keep Magma away from Ruri and give her the drug.
14✓ WatchedMaster of FlameAfter Magma's series of tricks to reach the final match, Chrome reveals a trick of his own! With a little extra help from Gen, Chrome just may be able to pull this one off!
15✓ WatchedThe Culmination of Two Million YearsAfter Senku's unlikely victory, quick marriage, and even hastier divorce, the kingdom of science is back to work to finally finish Ruri's medicine!
16✓ WatchedA Tale for the AgesRuri reveals the origin of the village's name and Senku learns of his father's fate!
17✓ WatchedA Hundred Nights and a Thousand SkiesByakuya and the astronauts' story continues, and Senku's connection to Ishigami Village and the Hundred Tales is finally revealed.
18✓ WatchedStone WarsTsukasa's army is coming! Kinro struggles to hold the bridge against the deadly spearman Hyoga and his shock troops, but Senku and the villagers are ready with deadly new weapons of science!
19✓ WatchedTo ModernityHyoga is disarmed, but the kingdom of science is still in danger - Ishigami village is in flames! And Tsukasa will soon know that Senku is still alive... How will the villagers fight off the coming invasion?
20✓ WatchedThe Age of EnergyWork begins on creating the components for Senku's cell phone, but spinning gold wire is proving to be quite the task! Luckily, Chrome and Kaseki "invent" the water wheel and drastically improve the process!
21✓ WatchedSpartan Crafts ClubWith Chrome and Kaseki’s water wheel finished, Ishigami Village moves into the age of electricity! But with the primitive materials available to him, will Senku be able to create a filament that can withstand the intense heat of operating a vacuum tube?
22✓ WatchedThe TreasureSenku, Chrome, and Magma venture into a cave in search of Tungsten, but there's a suspicious accident that leaves Senku and Chrome trapped at the bottom of a pit! What is Magma up to?!
23✓ WatchedWave of ScienceSenku and the rest of the village get to work on making the components for the cell phone. It's hard work but everyone is pumped!
24✓ WatchedVoices Over Infinite DistanceAfter a successful test of their new cell phone, Senku learns of a mysterious tale about a bee named Speaker who can play the voices of the dead.
1✓ WatchedStone Wars BeginningSenku continues in trying to advance the Stone World, this time he makes "space food", it is in actuality cup noodles. After Senku finishes his project, Gen has an epiphany and devises a plan to take down Tsukasa's army without violence.
2✓ WatchedHot LineWhile Senku's diversion buys Gen and others some time, soon Homura realizes something is not right.
3✓ WatchedCall from the DeadTaiju and Yuzuriha are on the verge of tears after they hear Senku's voice, and Senku informs them of his plan to win the war without any bloodshed.
4✓ WatchedFull AssaultChrome and Magma struggle with Ukyo, while Senku, gets his hands busy with building up an invention; a new hope.
5✓ WatchedSteam GorillaThe final touches to the automobile are made and it is used to transport the science supplies to a fortified cliffside that's close to the Tsukasa empire. From there the automobile is upgraded into a tank, but unbeknownst to the rescue group preparations by the empire have been made to counter any vehicular attack.
6✓ WatchedPrison BreakChrome must use all of his scientific knowledge to escape from his prison and save Senku and others.
7✓ WatchedSecret MissionSenku decides to use the Steam-Gorilla to capture The Miracle Cave. Using Lillian's recording, Senku gains the trust of more of Tsukasa's men. Ukyo reveals he saw Yuzuriha's secret mission to reassemble the fragments of statues Tsukasa destroyed.
8✓ WatchedFinal BattleThe Final Battle for the miracle cave starts as Senku and the Kingdom of Science conduct a frontal assault on the cave.
9✓ WatchedTo Destroy and to SaveTsukasa and Hyoga are coming to capture the miracle cave. The Kingdom of Science must buy Senku and Chrome some time to turn the tide, or it is all over.
10✓ WatchedHumanity's Strongest Tag TeamSenku demands a truce from Tsukasa in return for reviving his sister, Mirai, who Tsukasa comes to know is alive, but a new problem shows up when Hyoga shows his true self.
11✓ WatchedPROLOGUE OF Dr. STONEThe Kingdom of Science is victorious, however it is not over for Senku. Senku must use all of his knowledge to cure Tsukasa who is severly injured.
1✓ WatchedNEW WORLD MAPWhile continuing to use the hot air balloon to search for the oil, it's decided that Ishigami Village needs to take up agriculture to prevent future food shortages, as well as to produce preserved food for their upcoming sea voyage.
2✓ WatchedGreed Equals JusticeThe Kingdom of Science will need rations to last them through their voyage to the other side of the world. But Senku, being no professional, burns all the bread he attempts to bake.
3✓ WatchedFirst ContactSenku, brings along a team to look for the Sagara Oil Fields. Meanwhile, Suika and Francois go truffle hunting.
4✓ WatchedEyes of ScienceThe morse code signal reading "WHY" saturates the airwaves too much for Ukyo to pinpoint a direction, so the Kingdom of Science works on a way to visualize the signal.
5✓ WatchedScience Vessel PerseusKaseki's efforts to build the science vessel Perseus hit a roadblock when he realizes that it's impossible to get all the parts to fit in practice.
6✓ WatchedTREASURE BOXThe Perseus crew are on their way to the treasure island, the birthplace of the Hundred Tales, where they hope to locate the treasure box left behind by the Soyuz crew.
7✓ WatchedRay of Despair, Ray of HopeThe Perseus arrives at the treasure island. A recon squad consisting of Senku, Soyuz, Kohaku, and Gen set off to locate the platinum and make contact with the islanders. Ukyo later discovers something on the seafloor and send Ginro to investigate.
8✓ WatchedThe Trump Card Aboard the Science VesselAmaryllis explains how she evaded petrification and how she came to her decision to sneak into the inner palace.
9✓ WatchedBeautiful ScienceSuika and Ginro work together to rescue the mobile lab from the Perseus. Reunited with Senku and the others, the group works on items to help Kohaku with the selection process.
10✓ WatchedSCIENCE WARSAmaryllis, Ginro and Kohaku are chosen to join the inner palace. The science team will need a way to communicate with them in secret, and, eventually, a way for them with the science team.
11✓ WatchedWith This Fist, a MiracleKohaku has located the treasure left behind by Byakuya and the others, but it's encased in concrete. Senku has to devise a plan to quietly get at the contents inside, so as to not alert the guards.
12✓ WatchedThe Kingdom of Science's CounterattackKohaku is forced to destroy Ryusui's statue to prove that she isn't a spy.
13✓ WatchedThe Medusa's True FaceThe team revives Kaseki to work on the drone. Meanwhile, Ginro is called to see the Master.
14✓ WatchedDeal Game, Test of WitMore of the Kingdom of Science is brought back from petrification, but they are discovered in the cave by Moz.
15✓ WatchedBattle in Three DimensionsMoz and the Kingdom of Science form a tenuous, temporary alliance against Ibara. How long it will last is a question they can't afford to concern themselves with just yet.
16✓ WatchedTotal WarThe Kingdom of Science attacks and tries to execute their plan to steal the petrification device. Moz convinces Kirisame to use the device, but Ryusui's instincts tell him something is off about the situation.
17✓ WatchedJOKERThe Kingdom of Science members launch an attack on the islanders aboard the Perseus, but Moz isn't far behind and Senku and the others are forced to retreat inside the vessel. Ibara has them cornered, but Senku unleashes his Joker card.
18✓ WatchedFlicker of DoomYo and the Kingdom of Science capture the petrification device, but Ibara isn't going down without a fight.
19✓ WatchedLAST MAN STANDINGMuch to Ibara's shock and dismay, Senku devised a plan and managed to escape petrification. Now the two enter into a head-to-head battle for control of the Medusa device.
20✓ WatchedFIRST DREAMSenku stands victorious. He then works on reviving the others and fixing their communications device, but while they are talking with Ruri they encounter a strong interference with the signal.
21✓ WatchedTreasure IslandTo the moon! That's the plan, at least. Senku and the Kingdom of Science need to devise a means with which to go to the moon and deal with Why-Man. The first step is allying with the people of Treasure Island and enlisting their help with some new crafts.
22✓ WatchedBEYOND THE NEW WORLDWith the petrification device in the Kingdom's hands, it's time to revive Tsukasa. But there's just one problem: the device is out of batteries.
1✓ WatchedRYUSUI VS. SENKUSenku and his companions finally set off for America in search of corn. However, a dispute arises between Ryusui and Senku shortly after they depart.
2✓ WatchedSCIENCE JOURNEYMaintaining morale will be critical on the long journey to the Americas. Knowing where on the ocean you are is pretty important, too. The crew of the Perseus discuss.
3Now playingLight Trap in the DarknessThe Perseus lands in the Americas. They first head to Northern California in search of yellow dent corn, but discover a lot more than that.
4✓ WatchedDr. XThe search party narrowly escaped enemy machine gun fire. Unfortunately, the respite was short-lived.
5✓ WatchedDOCTOR VS. DOCTORTensions rise as Dr. Xeno makes his introductions to the Perseus.
6✓ WatchedSCIENCE IS ELEGANTStanley orders Luna to infiltrate the Perseus and identify Doctor Taiju. Things go sideways when it turns out to be a little too easy.
7✓ WatchedThe Two ScientistsSenku had gotten his start in rocket building through an email exchange with Doctor Xeno. Their approaches to science soon diverged.
8✓ WatchedLOCK ONNASA scientist Dr. Xeno attempts to pick off the leader of the Kingdom of Science.
9✓ WatchedLight of ScienceWith Senku having been shot, the Kingdom of Science plots its retaliation against Dr. Xeno.
10✓ WatchedDirty RoadsWith Senku still confined to the bed, Chrome's team begins work on the tunnel to Xeno's base.
11✓ WatchedThose Who Know the Rules; Those Who Make ThemRyusui and Senku take to the skies in a science versus science dogfight while Xeno's forces mount a ground counterattack.
12✓ WatchedReunionXeno's army attacks and when all seems lost, Chrome and his friends finish the tunnel and capture Xeno.
13✓ WatchedWatching the Same MoonThe team head to the source of the petrification beam in South America as they flee from Stanley's ship.
14✓ WatchedEARTH RACESenku and company must flee from Stanley's ship, but they have to make stops to refuel.
15✓ WatchedThe EscapeWith Stanley's ship hot on their tail, can science help Senku and company escape?
16✓ WatchedMedusa MechanismThe team is going to need a weapon for when Stanley inevitably catches up to them.
17✓ WatchedSickening Yet BeautifulSenku and his team have lost Stanley for now, but they aren't out of — or rather, in — the woods just yet.
18✓ WatchedDiamond HeartThe team discovers a giant pile of petrification devices. They take them apart to see what makes them tick.
19✓ WatchedStone SanctuaryThe team begins making, digging for, and polishing diamonds to replace the burnt-out ones inside the devices.
20✓ WatchedWhat I Once Sought to DestroySuika is in charge of making sure Senku's plan works, but her kindness becomes an obstacle.
21✓ WatchedOur Dr. StoneWith the revival team captured, it's up to Luna and Chelsea to revive everyone when the time comes.
22✓ WatchedUntil We Meet AgainWith the petrification beam approaching, who will get their hands on the revival fluid?
23✓ WatchedScientist, All AloneSuika gathers the team's statues, sets up camp and gets to work doing science.
24✓ WatchedWhole New WorldWith Senku back, it's only a matter of time before the rest of the Kingdom of Science is revived.
25✓ WatchedFuture EngineSenku and Dr. Xeno team up to gather the materials needed to make a rocket engine.
26✓ WatchedFireThe crew arrives in Spain, where they collect fluorite, olive oil and some treats.
27✓ WatchedThe Universe Is Written in the Language of MathematicsThe New Perseus sets out to India to recruit mathematicians for the space program.
28✓ WatchedDawn of the ComputerThe computer that the team is building is a series of toroidal tubes. Senku explains.
29✓ WatchedThe Truth About the RocketThe team gets to work wiring up several megabits' worth of memory donuts for their computer.
30✓ WatchedStone to SpaceThe team will need a stupidly insane amount of electricity to turn their bauxite into an aluminum rocket body.
31✓ WatchedUnknown KnownWith the computer completed, the team will need a user interface: a TV.
32✓ WatchedChallengers of ScienceThe Kingdom of Science's rocket launches are mired by a string of rapid unscheduled disassemblies.
33✓ WatchedWanting EverythingThe team is too small to build a round-trip rocket. They'll need to enlist help from around the world.
34✓ WatchedCountdownRyusui may need to defer to a better pilot for the moon mission.
35✓ WatchedGiant StepThe rocket needs to be assembled in space. Not an easy feat in the 21st century, let alone in the stone world.
36✓ WatchedWhy-ManThe team sets foot on the moon to confront Why-Man.
37✓ WatchedUshers of an Exhilarating FutureSenku offers Why-Man more exhilaration than they can handle.
About the series
Dr. STONE · 2019–2026
One fateful day, all of humanity was petrified by a blinding flash of light. After several millennia, high schooler Taiju awakens and finds himself lost in a world of statues. However, he’s not alone! His science-loving friend Senku’s been up and running for a few months and he's got a grand plan in mind—to kickstart civilization with the power of science!
Dr. STONEDr. STONE: questions & answers
Where can I watch Dr. STONE online for free?
Right here: this page has the official Dr. STONE trailer in HD and the player, free and without sign-up.
Can I download Dr. STONE for free?
No. Dr. STONE can't be downloaded from this site and there are no torrent links — the page is for watching online: the trailer and the player.
What is Dr. STONE about?
One fateful day, all of humanity was petrified by a blinding flash of light. After several millennia, high schooler Taiju awakens and finds himself lost in a world of statues. However, he’s not alone!
Is Dr. STONE dubbed or subbed?
That depends on the video: when the player has Dr. STONE, the audio tracks and subtitles it carries are listed right above it. The original Japanese track is the usual default.
How many seasons and episodes does Dr. STONE have?
Dr. STONE has 4 seasons and 94 episodes.
