|This article is about a/an episode in Kagaku Sentai Dynaman.|
Rejuvenate! Genius Brain (若返れ! 天才頭脳 Wakagaere! Tensai Zonō) is the thirty-eighth episode of Kagaku Sentai Dynaman. This episode features an important turning point within the Jashinka Empire, associated with General Zenobia and the fate of Prince Megiddo.
A Mechavolution Beast created by Zenobia's orders makes an old scientist young again, forcing Rei to protect him from their desires to access a weapon he developed.
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- Hokuto Dan (弾 北斗 Dan Hokuto): Satoshi Okita (沖田さとし Okita Satoshi)
- Ryuu Hoshikawa (星川 竜 Hoshikawa Ryū): Jyunichi Haruta (春田 純一 Haruta Jun'ichi)
- Yousuke Shima (島 洋介 Shima Yōsuke): Kouji Unogi (卯木浩二 Unogi Kōji)
- Kousaku Nangou (南郷 耕作 Nangō Kōsaku): Yuu Tokita (時田優 Tokita Yū)
- Rei Tachibana (立花 レイ Tachibana Rei): Sayoko Hagiwara (萩原 佐代子 Hagiwara Sayoko)
- Dr. Kyutaro Yumeno (夢野久太郎 Yumeno Kyutarō): Junshi Shimada (島田順司 Shimada Junshi)
- Emperor Aton (帝王アトン Teiō Aton, Voice): Takeshi Watabe (渡部 猛 Watabe Takeshi)
- Megiddo (メギド Megido): Kenju Hayashi (林健樹 Hayashi Kenju)
- Princess Chimera (キメラ Kimera): Mari Kouno (香野麻里 Kōno Mari)
- General Zenobia (女将軍ゼノビア Onna Shōgun Zenobia): Ritsuko Fujiyama (藤山律子 Fujiyama Ritsuko)
- General Kar (カー将軍 Kā Shōgun): Masashi Ishibashi (石橋雅史 Ishibashi Masashi)
- Bilgis (ビルギス Birugisu): Kasumi Yasuda (安田加寿美 Yasuda Kasumi)
- Armor Rose (ヨロイローズ Yoroirōzu, Voice): Toku Nishio (西尾徳 Nishio Toku)
- Taro Nakamura (中村太郎 Nakamura Tarō): Rikiya Iwaki (岩城力也 Iwaki Rikiya)
- Viewership: 9.5%
- Due to the events of this episode, the ending changes replacing the Megiddo/Chimera shot with a new outdoor shot of Zenobia with Chimera. (though sent to the Millennium Cave in the story, Megiddo can still be seen in the long shot of the Jashinka court at the start of the ending)
- The backstory and the weapon developed by Professor Nakamura is one of the few times in the Sentai franchise to mention the horrors Japan itself committed during World War II.
Kagaku Sentai Dynaman Volume 4 features episodes 31-40.