|This article is about a/an episode in Tensou Sentai Goseiger.|
Agri feels sorry for himself when he lets a family become separated by a Yuumajuu working with Buredoran to manipulate Gosei Knight's power for themselves.
As the Gosei Angels talk about the turn of events with Gosei Knight with the intent to grant his trust much to Agri's dismay, Buredoran finds Giemurou of the Kappa to use in his own plan for Gosei Knight. After using his ticks to capture several people, Giemurou battles the Goseigers before Gosei Knight arrive. Overpowering the Yuumajuu at first, nearly getting some people caught in the crossfire as Gosei Black is unable to save a little girl named Kanako from a tick, Gosei Knight is captured with Buredoran's aid. Later, as they try to make amends with Kanako's father, the Gosei Angels reveal their identities while promising to save the girl before others leave to find her as Moune consoles her brother. After hearing the man telling his wife to believe in them, Agri gains the strength to join his team. While this occurred, finding himself trapped and his Leon Cellular taken, Gosei Knight's power is siphoned by the tick and transferred to the hostages, turning them into Kappas and have them covert other humans while they suck up Earth's waters. As Gosei Blue and Pink fight Giemurou with the Landick siblings arriving for support, Gosei Knight is horrified to learn of Buredoran's scheme as Gosei Red battles him. As the two fights collide, Gosei Knight grieves about being used to kill the planet until the Landick siblings snap him of it before they attempt to free him to his shock. Seeing the Goseigers' determination to save the world, Gosei Knight breaks free from his cage and battles Buredoran and Giemurou, defeating the latter as Buredoran summons the Bibi Bugs to enlarge Giemurou. Stopping the Goseigers from summoning their Headders, Gosei Knight summons the Knight Brothers into battle as he becomes Groundion, combining with them to become Gosei Ground and destroy Giemurou. Later, as Kanako is reunited with her parents as Agri erases their memories of the incident, Gosei Knight turns down their offer of joining them before he takes his leave as Alata tells him their missions are the same.
- Alata (アラタ Arata): Yudai Chiba (千葉 雄大 Chiba Yūdai)
- Eri (エリ): Rika Satoh (さとう 里香 Satō Rika)
- Agri (アグリ Aguri): Kyousuke Hamao (浜尾 京介 Hamao Kyōsuke)
- Moune (モネ Mone): Mikiho Niwa (にわ みきほ Niwa Mikiho)
- Hyde (ハイド Haido): Kento Ono (小野 健斗 Ono Kento)
- Gosei Knight (ゴセイナイト Gosei Naito, Voice): Katsuyuki Konishi (小西 克幸 Konishi Katsuyuki)
- Nozomu Amachi (天知望 Amachi Nozomu): Sakuya Nakamura (中村 咲哉 Nakamura Sakuya)
- Professor Shuichiro Amachi (天知秀一郎 Amachi Shūichirō): Louis Yamada LIII (山田ルイ53世 Yamada Rui Gojūsan-sei)
- Datas (データス Dētasu, Voice): Kōki Miyata (宮田 幸季 Miyata Kōki)
- Makuin of the Blob (ブロブの膜イン Burobu no Makuin, Voice): Chafurin (茶風林 Chafūrin)
- Kinggon of the Bigfoot (ビッグフットの筋グゴン Biggufutto no Kingugon, Voice): Kosuke Takaguchi (高口 公介 Takaguchi Kōsuke)
- Buredoran of the Chupacabra (チュパカブラの武レドラン Chupakabura no Buredoran, Voice): Nobuo Tobita (飛田 展男 Tobita Nobuo)
- Giemurou of the Kappa (河童のギエム郎 Kappa no Giemurō, Voice): Ryūzaburō Ōtomo (大友 龍三郎 Ōtomo Ryūzaburō)
- Satoshi Tamura (田村聡 Tamura Satoshi): Teruaki Ogawa (小川 輝晃 Ogawa Teruaki)
- Kyoko Tamura (田村今日子 Tamura Kyōko): Satomi Hirose (広瀬 仁美 Hirose Satomi)
- Kanako Tamura (田村可奈子 Tamura Kanako): Rinka Inagaki (稲垣鈴夏 Inagaki Rinka)
- Gosei Red - N/A
- Gosei Pink - N/A
- Gosei Black - Memorybury
- Gosei Yellow - N/A
- Gosei Blue - N/A
- Gosei Knight - Vulcan Headder, Knight Dynamic, Knight Brothers, Gosei Ground, Victory Charge (Gosei Ground)
- As part of Super Hero Time, this episode aired alongside Kamen Rider W episode 39, The Likelihood of the G/Bad Cinema Paradise.
- Viewership: 5.8%
- Pre-Break: Gosei Black
- Post-Break: Gosei Black
- Teruaki Ogawa and Satomi Hirose, otherwise known as NinjaRed/Black Knight and NinjaWhite from Ninja Sentai Kakuranger and Seiju Sentai Gingaman, made guest appearances in this episode as Kanako's parents, Satoshi and Kyoko. They would be familiar faces to the Goseiger audience thanks to Super Sentai Versus Series Theater, which had screened their appearance in Ohranger vs. Kakuranger, while Ogawa would later be seen as Hyuuga in both Gingaman vs. Megaranger and GoGoFive vs. Gingaman
- They will both appear as part of the anniversary guest spots in the next series. Ogawa will return as Hyuuga in episode 20 as well as a voice-only cameo as NinjaRed in Gokaiger Goseiger Super Sentai 199 Hero Great Battle, while Hirose will make a cameo as Tsuruhime at the end of episode 45.
- This episode aired on the same day of the fifth episode of Super Sentai Versus Series Theater, featuring pt. 1 of Denji Sentai Megaranger vs. Carranger
Tensou Sentai Goseiger Volume 5 features episodes 17-20: Epic 17: A New Enemy! The Spectral Demon Beasts, Epic 18: The Earth Purifying Knight of Destiny, Epic 19: Gosei Knight Will Not Allow It, and Epic 20: Fall In Love Goseigers.