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The Age of Energy (動力の時代 Dōryoku no Jidai) is the twentieth episode of the Dr. Stone anime.

Summary

Tsukasa plans a second attack after a few months of preparation. He has no idea what Senku and his kingdom are cooking up in the meantime.

Plot Details

Gen impersonating Tsukasa.

Senku and Gen start to think what Tsukasa will do. They perfectly predict what Tsukasa is thinking. Tsukasa knows that in time, he will gain bigger army, but it will give time for Senku to create more gunpowder and other weapons. Given that their fortress is on an island in a lake, they have the defense upperhand and it will be hard during winter. Tsukasa tells Hyoga that he will place men watching Taiju and Yuzuhara in case they are spies and is concerned if Senku decides to attack preemptive. Hyoga tells him he left Homura watch over Ishigami Village, but finds it ironic that they lack communication technology, which is needed in such war. Tsukasa decides they attack after winter ends with Senku guessing their time limit is spring.

The girls trying cotton candy.

Chrome and Kaseki are wondering how the phone works and Senku explains that the voice creates vibrations which pointed at diaphragm, create small electrical current in rhythm with the vibration. Using a vacuum tube, they increase the current power. Sending it around and around in a circle creates radio wave and the listening side does the opposite and receives the message. As first step into making phones, they need to create cotton candy machine. Creating the machine, Senku explains that putting sugar and rotating it, causes small sugar threads to come out. But if they replace the sugar with gold, they will get gold threads. As gold is precious, Senku decides to test it with sugar first.

Homura trying cotton candy.

They take sugar crystals from the burn wine in the village. They make cotton candy and the villagers end up loving it as its their first time tasting a food like that. Senku asks Gen what type is Homura with Ginro guessing Senku is interested in her romantically, but Senku explains she is watching them. Gen explains Hyoga only trusts her and she follows his orders and is unlikely that she will betray him and join them. Senku makes a stand closer to Homura and leaves cotton candy. The others wonder why he did it, and Senku reveals that it may help making her join them. Ruri guesses he also just wanted to share cotton candy with a girl. Initially Homura refuses to eat it, but recalling how Hyoga told her that they won't leave anyone behind, she ends up tasting it.

Ginro using the gearg.

Ginro can't understand why Gen and Senku are discussing the balance of the cotton candy, but they explain it had lumps, which means the gold will also have lumps and they need to find the reason and fix it. Making cotton candy again, they see that the rotation speed drops when the ropes change and that causes the lumps. Unable to use more people as the winter is coming, Senku decides to make a gear. He finds Kohaku's shield to be perfect for that, which causes Kokuyo to recall how he won it and gave it to his daughter, but believes it will be precious to Kohaku as he gave it to her, however Kohaku doesn't think twice and immediately agrees to use the shield as gear, crushing Kokuyo's soul. Seeing the gear in action, Chrome gets and idea and shares it with Kaseki, which super excites him. Senku reveals the wire needs to be long enough to reach the top of the mountain, which shocks everyone.

After three days of work, Chrome tells Senku that he is ready. Senku is surprised to see they made a waterwheel without any knowledge about it. He immediately combines it with their generator and creates a hydroelectric power plant.

Characters

Locations

Inventions and Discoveries

  • Cotton Candy
  • Gold Thread
  • Waterwheel/Hydroelectric Power Plant

Anime to Manga Differences

Site Navigation

[v  e]
Story Arcs
Prologue Saga
Stone Formula Arc
Chapters 1234
Episodes 12
Vs. Tsukasa Arc
Chapters 56789101112
Episodes 345
Ishigami Village Saga
Kingdom of Science Arc
Chapters 131415161718192021222324252627282930313233
Episodes 5678910111213
Village Games Arc
Chapters 34353637383940
Episodes 131415
Village Origins Arc
Chapters 4142434445
Episodes 1617
Stone Wars Saga
Vs. Hyoga Arc
Chapters 4647484950
Episodes 1819
Communications Arc
Chapters 5152535455565758596061626364656667686970717273747576777879808182
Episodes 20212223242526272829303132333435
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Episodes
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Episodes
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
Episodes
New Stone World Arc
Chapters 194195196197198199200
Episodes
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Episodes
Stone to Space Saga
Moon Mission Arc
Chapters 213214215216217218219220
Episodes
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