|This article is about a/an episode in Hikari Sentai Maskman.|
The Great Destruction of the Underground Empire Castle! (地帝城大崩壊! Chitei Shiro Dai Hōkai!) is the fifty-first and final episode of Hikari Sentai Maskman. It is the conclusion of Maskman's four-episode endgame.
As Zeba finally unleashes eternal darkness upon the world, the Maskman must work with the twins of the Igam royal family and complete the restoration of light upon two realms.
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- Takeru (タケル): Ryousuke Kaizu (海津亮介 Kaidu Ryōsuke)
- Kenta (ケンタ): Koichi Kusakari (草刈滉一 Kusakari Kōichi)
- Akira (アキラ): Issei Hirota (広田一成 Hirota Issei)
- Haruka (ハルカ): Yuki Nagata (永田由紀 Nagata Yuki)
- Momoko (モモコ): Kanako Maeda (前田夏菜子 Maeda Kanako)
- Commander Sanjuurou Sugata (姿 三十郎 Sugata Sanjyurō): Hayato Tani (谷 隼人 Tani Hayato)
- Azuma: Reiko Shichida (七田玲子 Shichida Reiko)
- Earth Emperor Zeba (地帝王ゼーバ Chiteiō Zēba, Voice): Seizō Katō (加藤 精三 Katō Seizō)
- Earth Imperial Ninja Oyobu (地帝忍オヨブー Chiteinin Oyobū): Yoshinori Okamoto (岡本美登 oshinori Okamoto)
- Earth Imperial Prince Igam (地帝王子イガム Chiteiōshi Igamu), Princess Ial (イアル姫 Iaru-hime): Mina Asami (浅見 美那 Asami Mina)
- Earth Imperial Ninja Fumin (地帝忍フーミン Chiteinin Fūmin): Kaori Kubota (久保田香織 Kubota Kaori)
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- Viewership: 13.5%
- At the end of the episode, a preview for Choujuu Sentai Liveman airs for the first episode
- This is the last time the Maskman are together as a team, until the Great Legend War
- Ryousuke Kaizu (Takeru) will have multiple Sentai cameoes beyond this, including in Fiveman, Dairanger and Ohranger; his footage as Red Mask will likewise appear in Hyakujuu Sentai Gaoranger vs. Super Sentai
- Yuki Nagata (Haruka) appears in episode 6 of Fiveman, and episode 51 of Lupinranger vs Patranger.
- Kanako Maeda (Momoko) will appear as Back Dimension Dimensian Soldier Kanna in two episodes of Jetman
- Issei Hirota (Akira) returns in a cameo in the fourty-ninth episode of Gokaiger
- Final Sentai Appearance of Kouichi Kusakari (Kenta)
Hikari Sentai Maskman Volume 5 features episodes 41-51.