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Dr. Stone Wiki

Top Secret Mission (極秘のミッション Gokuhi no Misshon) is the thirty-first episode of the Dr. Stone anime, and the seventh episode of the second season.


Chrome reunites with the rest of the Kingdom of Science and is brought up to speed on their latest inventions, namely the automobile. Meanwhile, Taiju, Yuzuriha, and Gen continue bringing members of the Tsukasa empire to their side using the cell phone and Lillian's recording.

Ukyo discovers this ploy, and rather than ratting them out to Tsukasa, joins them on the condition that nobody dies during the takeover. Senku agrees, and the final preparations for the battle ahead are completed just in time as Tsukasa discovers the hidden cell phone.

Plot Details[]

The episode begins with Chrome recounting how he broke out of jail and explaining how Taiju must've helped him out by passing him the battery. Senku replies that there's no way Taiju would've thought to do that, and was probably Yuzuriha, despite how busy she should be with her secret mission.

Eager to show Chrome, Kaseki rolls up with the Steam Gorilla, wowing him. Senku continues explaining their plan of taking the Cave of Miracles, which would stop the Tsukasa Empire from reviving any more members, while also trying to bring existing empire members to their side with Taiju and Yuzuriha's help.

Gen as Lillian

After gathering a large group of empire members to Senku's grave marker, Gen puts on his little Lillian Weinberg performance to try and persuade them that America is fully functional and will come to save them. While the empire members insist that the US military will easily overpower Tsukasa, Gen-as-Lillian insists they should try stopping any more statues getting broken since it'll be some time before they're able to reach it.

During one of these cell phone conversations, the sound of their group alerts Ukyo. He approaches the cell phone receiver and begins speaking to "Lillian," catching on that it was, in fact, Gen almost immediately by the fact that the voice he was hearing wasn't affected by the powerful singing. Despite this, he hides what he knows from the rest of the group, which makes Gen realize he isn't necessarily on Tsukasa's side but isn't on theirs yet either.

Ukyo is revived

Ukyo explains that he saw Yuzuriha's secret mission to rebuild the statues Tsukasa had broken and that he thinks it's crazy that Senku and the others are still trying to save everyone even in this state. Meanwhile, Tsukasa is told that Yo died falling off the waterfall cliff, but in reality, he simply wanted to avoid responsibility for Chrome's escape.

To persuade him to join the Kingdom of Science, Ukyo has one condition: nobody dies. Senku easily agrees since that was his plan anyway. There is also a scene showing Ukyo's revival, where Minami explains his incredible hearing and skills as a sonar operator, along with his experiences so far in the Tsukasa Empire. Ukyo also informs them that Hyoga lied about what happened previously, saying that Senku was the one to kill his subordinates rather than Hyoga himself pushing them into Sulfurina's path.

Yuzuriha rebuilds the statues

Sometime later, Hyoga visits Senku's grave and notes that the footprints are too neat as if they'd been specifically planted there for show. Tsukasa joins him, paying respects to Yo and beginning to dig a small hole to bury Yo's stone eyepiece.

The tank gets completed, and Senku demonstrates their new weapon of science: a rupture disc designed to scare the enemy into thinking they have better weaponry. To help them, Senku knows they'll need the help of Taiju, who has a heartfelt reunion with Senku along with Yuzuriha, and so, the villagers finally meet the people Senku's been talking about the whole time.

As the Kingdom of Science prepares for battle, Tsukasa discovers the cell phone receiver and realizes that the Cave of Miracles is in danger. Senku points out that they'll only have 20 seconds to take the cave; otherwise, people will begin dying.






Inventions and Discoveries[]

  • Rupture Disk Gun

Anime to Manga Differences[]

  • The episode began with a recap of Chrome's escape rather than him directly explaining it like it happened in the manga.
  • An extra scene showing Chrome's concern about the viability of Gen's Lillian impression was added, which includes flashbacks of Chrome's experiences with Ukyo so far.
  • The scene of Tsukasa discovering Yo's disappearance was elaborated on and moved to between the two chapters rather than halfway through the second.
  • Ukyo's pacifistic reasons were elaborated on, showing his depetrification, his discussion with Tsukasa, and a flashback to him helping with disaster efforts.
  • More named fighters were added to the group shots, specifically Argo, Carbo, and Jasper, bringing the number of Kingdom of Science combatants to 10 on the ground and three in the tank.


  • Magma's undershirt was not colored correctly in one of the group shots.


  • The episode was named after Chapter 73.
  • Rather than speaking in a different language, the English dub has Ukyo continue speaking in English but says that he whispered it instead so that no one else could hear him.


Site Navigation[]

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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
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Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35Ryusui3637383940
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Episodes 4142434445464748495051525354
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Episodes 555657
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
New Stone World Arc
Chapters 194195196197198199200
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Stone to Space Saga
Moon Mission Arc
Chapters 213214215216217218219220221222223224225226227228229230231232