|This article is about a/an episode in Zyuden Sentai Kyoryuger.|
What's This! The Nightmare of the Deboth Army (ナニコレ！デーボスぐんのあくむ Nani Kore! Dēbosu Gun no Akumu) is the twenty-fifth episode of Zyuden Sentai Kyoryuger. Resentful Knight Endolf makes a brief appearance in this episode.
It's been a while after the defeat of the Deboth Army. Souji and Rin are walking to school, with Souji also thinking about what they should do about Candelila and Luckyuro. As the Kyoryugers discuss this with Torin, they agree to let both of them go because they can't harm people as they are now.
However, Souji is getting a nightmare in his dreams about dating Rin and being hit by his seniors, until Luckyuro shows herself posing as Rin. Souji is surprised and wakes up. The next day, Torin and Amy laugh at Souji for telling them his weird nightmare while surprisingly, Daigo, Ian, and Nobuharu also caught up with the same dream for seeing Luckyuro. Just when Amy and Torin feel weird, Torin catches the aura of Deboth attacking.
The Kyoryugers (without Utsusemimaru) battle the Zorima, but only Amy is capable because the others are tired due to not having enough sleep. Just as the pinch is coming, Utsusemimaru appears to help. However, he is also in the same condition as the others. When everyone wakes him up, the enemies finally show their true selves, Debo Akkumon with Luckyuro.
Luckyuro explains how frustrated she is as her team is destroyed while Candelila is seriously sick. For revenge, she creates her own Deboth Monster, Akkumoon. The Kyoryugers shoot them but only to be blocked by Debo Akkumoon who attacked them with a pillow bomb. Amy rushes on him only to be trapped with the sleeping pillow and goes to sleep and is infiltrated by Luckyuro and Akkumon.
Daigo saves Amy by waking her up with Ovirappoo, though he and his teammates also gets fuzzy because of the Ovirappoo smell. Both sides are retreating, while the Kyoryugers are finding a way to finish the enemy by not letting themselves get put to sleep.
Souji trains his throwing blade accuracy, but failed due to not having proper concentration. The others are staying on their own guard so they are not sleeping (except for Daigo, Ian, and Utsusemimaru who guard each other). Though all hope seem lost, Rin makes an energy soup for Souji and gives him a spirit to fight again.
The Kyoryugers are coming to the enemy place to fight, only to be hopeless because they are too tired. Souji arrives, but unknown to Souji the soup is totally disgusting. He forces himself to drink it, only to spit it out because of how nasty the taste is.
The soup is proven to be effective as Souji regains his strength and destroys Akkumon's barrier. Souji rushes himself to give the soup to the others (who also spit it out). The Kyoryugers transform and finish off Debo Akkumon easily and Akkumon in giant form is destroyed by Kyoryuzin Stegochi-Zakutor, Pteraiden-Oh, and Plezu-Oh's combination attack.
Luckyuro makes a run for it, but is cornered by the Kyoryugers who are ready to destroy him to put an end to the Deboth Army. However, before they can, the sky goes black as Chaos, Dogold, Aigaron and Candelilla reveal themselves to still be alive and the Frozen Castle to be restored. Chaos praises Luckyuro for giving him a plan to destroy the Kyoryugers and reveals that before Deboth could be destroyed he fused his heart with Chaos, who then saved Aigaron and Candelilla from their deaths, Chaos then promises that next time Deboth will reach his final evolution before he and others depart as Torin and the Kyoryugers realize the fight is still far from over.. In the evening, as Souji and Rin are walking home together, the others come to give thanks to Rin. However, Rin got mad at Souji as she only wanted him to drink it. But unknown to the Kyoryugers, Chaos has created a new general: Endolf.
- Daigo Kiryu (桐生 ダイゴ Kiryū Daigo): Ryo Ryusei (竜星 涼 Ryūsei Ryō)
- Ian Yorkland (イアン・ヨークランド Ian Yōkurando): Syuusuke Saito (斉藤 秀翼 Saitō Shūsuke)
- Nobuharu Udo (有働 ノブハル Udō Nobuharu): Yamato Kinjo (金城 大和 Kinjō Yamato)
- Souji Rippukan (立風館 ソウジ Rippūkan Sōji): Akihisa Shiono (塩野 瑛久 Shiono Akihisa)
- Amy Yuuzuki (アミィ結月 Amyi Yūzuki): Ayuri Konno (今野 鮎莉 Konno Ayuri)
- Utsusemimaru (空蝉丸): Atsushi Maruyama (丸山敦史 Māruyama Atsūshishi)
- Wise God Torin (賢神トリン Kenjin Torin, Voice): Toshiyuki Morikawa (森川 智之 Morikawa Toshiyuki)
- Many-Faced High Priest Chaos (百面神官カオス Hyakumen Shinkan Kaosu, Voice): Takayuki Sugō (菅生 隆之 Sugō Takayuki)
- Joyful Knight Candelilla (喜びの戦騎キャンデリラ Yorokobi no Senki Kyanderira, Voice): Haruka Tomatsu (戸松 遥 Tomatsu Haruka)
- Raging Knight Dogold (怒りの戦騎ドゴルド Ikari no Senki Dogorudo, Voice): Satoshi Tsuruoka (鶴岡 聡 Tsuruoka Satoshi)
- Sorrowful Knight Aigaron (哀しみの戦騎アイガロン Kanashimi no Senki Aigaron, Voice): Yū Mizushima (水島 裕 Mizushima Yū)
- Funfilled Spy Luckyuro (楽しみの密偵ラッキューロ Tanoshimi no Mittei Rakkyūro, Voice): Ai Orikasa (折笠 愛 Orikasa Ai)
- Debo Akkumoon (デーボ・アックムーン Dēbo Akkumūn, Voice): Kōki Miyata (宮田 幸季 Miyata Kōki)
- Rin Katsuyama (勝山りん Katsuyama Rin): Reika Fujisawa (藤沢 玲花 Fujisawa Reika)
- Kyoryu Red - Ovirappoo, Gabutyra + Gabutyra (Zyuden Brave Finish), Plezuon (Battle Mode), Gabutyra (Battle Mode)
- Kyoryu Black - Parasagun + Parasagun (Zyuden Brave Finish)
- Kyoryu Blue - Stegotchi + Stegotchi (Zyuden Brave Finish), Stegotchi (Battle Mode)
- Kyoryu Green - Zakutor (Zyuden Brave Slash), Zakutor (Battle Mode)
- Kyoryu Pink - Ovirappoo, Dricera + Dricera (Zyuden Brave Finish)
- Kyoryu Gold - Pteragordon (Battle Mode)
- As part of Super Hero Time, this episode aired alongside Kamen Rider Wizard episode 47, Wiseman's Truth.
- In the opening credits, the cast of Kamen Rider Wizard appear dancing with the Kyoryugers.
- Debo Akkumoon was voiced by Kouki Miyata. He previously lends the voice for Bakuryuu Triceratops from Abaranger and Datas from Goseiger.
- This episode continues to broke Sentai tropes. Instead of Kyoryugers performing standard roll calls, the Kyoryugers had to speed up their roll call and start running before the explosion ends. This is simply because they want to finish the battle quickly before the wake-up drink wears off.
- Luckyuro was nearly caught off-guard, since they didn't hear "It's going to be wild!" line.
Zyuden Sentai Kyoryuger Volume 7 features episodes 25-28: Brave 25: What's This! The Nightmare of the Deboss Army, Brave 26: Surprise! GabutyraMan, Brave 27: O Matsurincho! Red's Super Evolution and Brave 28: Oh Torin! The 100 Million Year-Old Grudge. 
- TV Asahi's official preview for ｢ナニコレ！ デーボスぐんのあくむ｣
- Toei TV's official episode guide for ｢ナニコレ！ デーボスぐんのあくむ｣