|This article is about a/an episode in Tokumei Sentai Go-Busters.|
Mission 8: Protect the Machine Blueprints! (マシン設計図を守れ！ Mashin Sekkeizu o Mamore!) is the eighth episode of Tokumei Sentai Go-Busters.
Ryuji is reunited with his old high school classmate Kazuya who has become one of the Go-Busters' engineers, while Enter tries to infiltrate the Go-Busters' base of operations to steal a new Buster Machine's blueprints.
After piloting the GT-02 Gorilla to get in some target practice, Ryuji meets with the others as Kuroki reveals that Enter has been sighted at the Megazord Development Facility and is likely after the blueprints to a new Buster Machine. When the Go-Busters intercept Enter when he poses as a cop during an uproar he caused, he uses Buglers to cover him as he tries to reach the blast doors.
However, after failing to get through in time, Enter escapes as Ryuji meets his old high school friend Kazuya. Kazuya takes the Go-Busters to the blueprints of the new Buster Machine BC-04, with the group realizing that Enter may be after them to fortify the Vaglass forces. Ryuji reveals that he and Kazuya were both interested in MegaZords as high school students, but after the incident 13 years ago, Ryuji was forced to give up his dream. Soon after, the EMC staff are alerted to the creation of DrillRoid and contact the Go-Busters of a Vaglass MegaZord's arrival within three minutes.
Realizing that Enter has an inside man, Ryuji decides to stay behind as the others enter the Buster Machines to deal with the enemy Megazord. However, though seeming to be a no-show, Red Buster realizes their enemy is underground, and right when he did, the DrillZord opens fire at the Busters. By that time, and realizing Kazuya has been helping Enter, Ryuji confronts Kazuya when he finds him copying the blueprint data into a memory drive and is shocked to find how disillusioned his friend became just before DrillRoid arrives and downloads the data from the computer with Ryuji forced to destroy the computer, shocking Kazuya at the inhuman strength Ryuji has gotten.
However, DrillRoid notices the memory drive with Blue Buster holding the MetaRoid off as Kazuya runs off with the item. Sadly unfortunate having second thoughts as Blue Buster destroys DrillRoid, Enter still manage to stole Kazuya's memory drive and fail the mission. Coming to the others' aid in the GT-02 Gorilla, Blue Buster joins the others in forming Go-Buster Oh and forcing the DrillZord to the surface so they can destroy it. Later, Ryuji finds a regretful Kazuya and he forgives his old friend while telling him to continue working for both him and their mentors.
- Hiromu Sakurada (桜田 ヒロム Sakurada Hiromu): Katsuhiro Suzuki (鈴木 勝大 Suzuki Katsuhiro)
- Ryuji Iwasaki (岩崎 リュウジ Iwasaki Ryūji): Ryoma Baba (馬場 良馬 Baba Ryōma)
- Ryuji Iwasaki (teenager): Koudai Matsuoka (松岡 広大 Matsuoka Kōdai)
- Yoko Usami (宇佐見 ヨーコ Usami Yōko): Arisa Komiya (小宮 有紗 Komiya Arisa)
- Cheeda Nick (チダ・ニック Chida Nikku, Voice): Keiji Fujiwara (藤原 啓治 Fujiwara Keiji)
- Gorisaki Banana (ゴリサキ・バナナ Banana Gorisaki, Voice): Tesshō Genda (玄田 哲章 Genda Tesshō)
- Usada Lettuce (ウサダ・レタス Usada Retasu, Voice): Tatsuhisa Suzuki (鈴木 達央 Suzuki Tatsuhisa)
- Takeshi Kuroki (黒木 タケシ Kuroki Takeshi): Hideo Sakaki (榊 英雄 Sakaki Hideo)
- Miho Nakamura (仲村 ミホ Nakamura Miho): Fuuka Nishihira (西平 風香 Nishihira Fūka)
- Tooru Morishita (森下 トオル Morishita Tōru): Naoto Takahashi (高橋 直人 Takahashi Naoto)
- Enter (エンター Entā): Syo Jinnai (陳内 将 Jinnai Shō)
- Messiah (メサイア Mesaia, Voice): Seiji Sasaki (佐々木誠二 Sasaki Seiji)
- DrillRoid (ドリルロイド Doriruroido, Voice): Keiichi Kuwabara (桑原 敬一 Kuwabara Keiichi)
- Kazuya Motomura (本村カズヤ Motomura Kazuya): Ryo Hashizume (橋爪 遼 Hashizume Ryō)
- Energy Management Center Member: Kei Kurahachi (倉八 慶 Kurahachi Kei), Junya Yoshikawa (吉川順也 Yoshikawa Junya)
- As part of Super Hero Time, this episode aired alongside Kamen Rider Fourze episode 31, Subaruboshi Kingdom.
- Viewership: 5.2%
- The new Buster Machine, whose blueprints were taken by Enter, is BC-04, the mecha for the upcoming Go-Buster, Beet Buster. Its name is revealed in the blueprints for the machine, although it is never mentioned in actual dialogue.
- Although not named, Masato Jin is alluded to when Ryuji mentions his mentor, as no other mentor of Ryuji's is ever mentioned being trapped with Masato.
- A catch-up talk of the first twenty episodes of Tokumei Sentai Go-Busters was aired as part of the Super Hero Max 2012 special event on TV Asahi. 
Tokumei Sentai Go-Busters Volume 2 features episodes 5-8: Mission 5: Dangerous Feverish Runaway!, Mission 6: Combine! Go-BusterOh, Mission 7: Bad Maintenance on Ace?! and Mission 8: Protect the Machine Blueprints!. 
- Thrills and Drills - Power Rangers counterpart in Beast Morphers. See comparison page. (fight footage & story)