The Secret of the Jewel People

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Machine Robo: Revenge of Cronos ep 35
"The Secret of the Jewel People"
("houseki choujin no himitsu")
Production company Ashi Productions
Airdate 5 March, 1987
Written by Rumiko Asao
Shunsaku Ban
Directed by Kiyoshi Murayama

Rom's Machine Robo army begins to take shape.

Celebration time!
Official release coming!

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The new Battle Base mobile fortress is ready and Bike Robo is training troops to man it while Rod Drill and Blue Jet oversee supplying the fortress. Rom and Pro Truck Racer are escorting a convoy with further munitions when they spot Magna Rock being pursued by Devil Rock and Double Rock so they intervene, saving him. They take Magna Rock back to the Battle Base, where he explains he has escaped from the Devil Cave where another prisoner is trapped. Rom, Drill, Pro Truck Racer, Triple Jim and Leina - after an argument with Min - set off with him to help. Meanwhile, on the Gyandlar mothership Grujios tells Gadess of the three powerful Jewel People, and the Gyandlar plan to capture them. Diondra sets off in the Varigale-X with Devil Satan 6, having deduced that Magna Rock came from Devil Mountain. Magna Rock has led Rom's party to the cave and they enter shortly before Diondra's team arrive. The mountain's defences activate, destroying Gildis and Zarios while blocking off the entrance.


Rom and the rest are bound by tentacles but the unaffected Magna Rock is able to save them with the Wolf Sword. The Gyandlar meanwhile decide to make their own entrance - watched from within the mountain itself by Mask Rock. Rom's party reaches the buried stranger - Ruby Man, another of the Jewel People; Rod and Pro Truck Racer are able to free him and Leina spots the Wolf Emblem carved into the rock he was buried under. Ruby Man shows his gratitude to his rescuers by instantly healing the wounds they suffered entering the mountain. Above, Diondra blasts an entrance, causing the cave to start collapsing so Rom summons Baikanfu to clear an exit for his party but the Gyandlar are waiting for them. They demand Ruby Man goes with them and are about to attack when Jet arrives with the reinforcements summoned by Mask Rock, forcing the Gyandlar into retreat. A furious Gadess orders Grujios and Garudi to recover the Jewel People as soon as possible. Back at the Battle Base, Rom and Mask Rock cement their alliance; unnoticed by everyone except Magna Rock, Ruby Man goes to see the Dragon Helmet, which glows in his presence.

Featured characters[edit]

(Numbers indicate order of appearance.)


  • Escaping from the black hole has given Grujios dark mystical powers.

Home video releases[edit]

Laser Disc

1992Machine Robo: Revenge of Cronos Box (Toshiba EMI)


2001Machine Robo: Revenge of Cronos DVD-Box 2 (Pioneer)


2022Machine Robo: Revenge of Cronos (Discotek Media, USA)