|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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- 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
- 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.