|This article is about a/an episode in Tokumei Sentai Go-Busters.|
Mission 49: Preparation and Selection (覚悟と選択 Kakugo to Sentaku) is the 49th episode of Tokumei Sentai Go-Busters. It is the fourth episode in Go-Busters five-part endgame. It features the full debut of Enter's Dark Buster and the television debut of MegaZord Omega after it's appearance in the Tokumei Sentai Go-Busters vs. Kaizoku Sentai Gokaiger: The Movie.
The Go-Busters begin to lose hope as Enter's ability to become more powerful with recreation allows him to assume a Red Buster-like form called Dark Buster. As Hiromu steals his resolve into sacrificing himself for the good of his friends, Masato tries to prepare an alternative involving Hyper Space.
Explaining how more powerful he has now become from copying Hiromu's data through the final Messiah Card with each demise and recreation, Enter transforms into a parody of Red Buster: Dark Buster. Now beyond the primary Go-Busters' ability to destroy with Powered Custom mode with an understanding of the human spirit and confidence that will soon have the power to change the world in his image, Dark Buster proceeds to overpower the five before taking his leave while telling them that the best is yet to come. After the others scold him for being reckless in trying to handle the Messiah Card on his own. When Ryuji promises to kill Hiromu if needed and Yoko having faith they can save him, Hiromu thanks them as he entrusts them with his life. Eventually, the group learns that Enter merged into an Enetron tank to convert it into a cocoon. But once inside to find survivors, the primary Go-Busters find most of the humans being assimilated into the building's structure with only two children spared. Enter reveals his evolution is nearly complete as the primary Go-Busters take the kids when Buglers manifest. Once the Buglers are dealt with, the primary members are called that Masato reveals that they are going into subspace through Hangar 4 for a risky gambit that could remove the card from the Hiromu. However they are unaware that the process will likely also destroy Masato's physical body. Knowing the risk as subspace is unstable since Messiah's defeat in the dimension, the Go-Busters resolve to take Enter with them to finish things with him there. As Go-Buster Oh and Buster Hercules are formed, Enter has the cocoon transform into Megazord Omega as it proceeds to assimilate the surrounding thirteen Enetron tanks to begin his. Though, Enter is knocked in Hangar 4 as he realizes their proceeds to tear the Energy Management Center apart. But with Tategami Lioh joining the fray, the Go-Busters' Megazords hold Megazord Omega long enough for all five Megazords to be transported into the unstable subspace. While the Go-Busters are unconscious, Enter surveys the dying landscape with the intent to return to reality.
- Hiromu Sakurada (橋爪 龍 Sakurada Hiromu): Katsuhiro Suzuki (鈴木 勝大 Suzuki Katsuhiro)
- Hiromu Sakurada (child): Ryu Hashizume
- Ryuji Iwasaki (岩崎 リュウジ Iwasaki Ryūji): Ryoma Baba (馬場 良馬 Baba Ryōma)
- Ryuji Iwasaki (teenager): Koudai Matsuoka
- Yoko Usami (宇佐見 ヨーコ Usami Yōko): Arisa Komiya (小宮 有紗 Komiya Arisa)
- Yoko Usami (child): Kokoro Hirasawa
- Masato Jin (陣 マサト Jin Masato): Hiroya Matsumoto (松本 寛也 Matsumoto Hiroya)
- 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 Gorisaki Banana, 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)
- Beet J. Stag (ビート・J・スタッグ Bīto Jei Sutaggu, Voice): Yuuichi Nakamura (中村悠一 Nakamura Yūichi)
- 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)
- Toru 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)
- GB Custom Visor Voice (GBカスタムバイザー音声 Jī Bī Kasutamu Onsei), Tategami Raioh AI Voice (タテガミライオーAI音声 Tategami Raiō Ē Ai Onsei): Ichirou Mizuki (水木 一郎 Mizuki Ichirō)
- As part of Super Hero Time, this episode aired alongside Kamen Rider Wizard episode 21, The Dragons' Wild Dance.
- Viewership: 4.9%
- This marks the second time Enter transforms into a Go-Buster, previously when he took Masato's Morphin Blaster and changed into Beet Buster in Tokumei Sentai Go-Busters vs. Beet Buster vs. J.
- This episode marks the last appearance of the main three Go-Busters primary mecha combination, Go-Buster Oh.
Tokumei Sentai Go-Busters Volume 12 features episodes 46-50: Mission 46: The New Fusion and Overheat Rampage!, Mission 47: Reset and Backup, Mission 48: Setting the Trap, Mission 49: Preparation and Selection and Final Mission: Eternal Bonds. 
- Beasts Unleashed - Power Rangers counterpart in Beast Morphers. See comparison page. (Dark Buster's debut)
- Crunch Time - Power Rangers counterpart in Beast Morphers. See comparison page. (fight footage & story)