Defeat the Demon (悪魔を討て! Akuma wo Ute!) is the eighth episode of Ultraman Taiga.
Night Fang defeated Taiga and has put people to sleep, trapping them in nightmares. Ai Tennoji awakens her hidden abilities to grant Taiga a new power.
Continuing from the previous episode, Taiga was still no match for Night Fang, even after getting hit by, using Blu-let, Aqua Blaster, the kaiju took off towards the city.
In the forest, after the villagers' disappearance into evil spirits, but Ai's power always brings misfortune. They returned to HQ, saw the origin photo about Night Fang sealing. As soon as it landed, Night Fang emitted sound waves from its third eye, causing everyone in the vicinity to fall asleep and get trapped in nightmares, which Night Fang fed off of, but Kirisaki watched.
Luckily, Pirika, who was still awake due to wearing headphones that muffled out the sounds, woke the city up using a noise cancelling wave. As the members woke up, Titas exercising on Ai's shoulder but she gets him off. Homare calls Pirika to start the broadcast, he hurries everyone to get into safety. Hiroyuki quickly transformed into Taiga, but was still not a match for Night Fang.
Seeing this, Ai decided to help instead of doing nothing. She called upon the shining golden sword of light, that was still stuck inside Night Fang, and granted it to Taiga. Taiga Key Holder reacted with it and absorbed its energy, transforming Taiga into his new form, Photon-Earth. With the power of the Earth within him, Taiga trounced Night Fang and destroyed it once and for all with the Aurum Strium. Kirisaki transforms into Tregear, surprised by Taiga's transformation into Photon-Earth and went to challenge him, finding out that Taiga had improved into a much more competent fighter. After a short battle, Tregear left, expecting nothing less of the son of Taro. Back inside the HQ, Ai continues as a net idol, she sees Hiroyuki that Taiga called that "red ogre".
On the Next Chance (次の機会に Tsugi no Kikai ni)
Titas and Fuma complain and rant because they didn't get a new form like Taiga did.
- Hiroyuki Kudo (工藤ヒロユキ Kudō Hiroyuki): Yuki Inoue (井上 祐貴 Inoue Yūki)
- Homare Soya (宗谷ホマレ Sōya Homare): Ryotaro (諒太郎 Ryōtarō)
- Pirika Asahikawa (旭川ピリカ Asahikawa Pirika): Ayuri Yoshinaga (吉永 アユリ Yoshinaga Ayuri)
- Kana Sasaki (佐々木カナ Sasaki Kana): Chiharu Niiyama (新山 千春 Nīyama Chiharu)
- Kirisaki (霧崎 ): Kou Nanase (七瀬 公 Nanase Kō)
- Ai Tennoji (天王寺 藍 Ten'nōji Ai): Sora Kurumi (胡桃 そら Kurumi Sora)
- Ultraman Taiga (ウルトラマンタイガ Urutoraman Taiga): Takuma Terashima (寺島 拓篤 Terashima Takuma)
- Ultraman Titas (ウルトラマンタイタス Urutoraman Taitasu): Satoshi Hino (日野 聡 Hino Satoshi)
- Ultraman Fuma (ウルトラマンフーマ Urutoraman Fūma): Shota Hayama (葉山 翔太 Hayama Shōta)
- Ultraman Tregear (ウルトラマントレギア Urutoraman Toregia): Yuma Uchida (内田 雄馬 Uchida Yuma)
- Ultraman Taiga: Hideyoshi Iwata (岩田 栄慶 Iwata Hideyoshi)
- Ultraman Tregear: Shinnosuke Ishikawa (石川 真之介 Ishikawa Shinnosuke)
- Night Fang: Shun Takahashi (高橋 舜 Takahashi Shun)
- The scene where Ultraman Taiga and Tregear strike each other in their faces with a punch is similiar to Ultraman Dyna and Imitation Dyna in Ultraman Dyna episode 31 "Fight! Dyna vs. Dyna".