|This article is about a/an episode in Kaizoku Sentai Gokaiger.|
The Day of Battle (決戦の日 Kessen no Hi) is the fiftieth and penultimate episode of Kaizoku Sentai Gokaiger. It is also the second part of the three-part finale to the Gokaiger series, which began in The Greatest Treasure in the Universe and concludes with Farewell Space Pirates.
Zangyack is advancing on their final plans, which includes an all out attack on the Gokaigers, and the ultimate destruction of Earth! It has been revealed that the Greatest Treasure in the Universe can, and must, be used to wipe out Zangyack's Great Fleet, completely. The Gokaigers are hesitant to do so, as the cost of the power would be the existance of the 34 senior Super Sentai...
The Gokaigers are blasted from above by a large fleet of Zangyack ships, which subsequently attack Tokyo. The Gokaigers transform and activate GokaiOh and GoZyuRex. The two mecha keep firing their weapons at the invaders, but the Zangyack keep coming in waves. The Gokaigers are blasted with heavy fire and Don sees they're heavily outnumbered. Luka says they still have the Greater Powers and Ahim agrees to put the powers of the Super Sentai to use. GokaiOh summons Pat Striker to form DekaGokaiOh, then launches the Pat Striker at enemy forces. The other Gokaigers summon GaoLion, Karakuri Warrior Fūraimaru, the Gosei Headders, the Geki-Beasts, and Engine Machalcon. The two form Go-On GokaiOh and attack Zangyack ships before sending Machalcon off solo. While in the air, Marvelous summons MagiDragon to form Magi GokaiOh. GoZyuRex transforms into GoZyuJin, and Gai gets the idea to use the MegaSilver Ranger Key to summon the Greater Power of the Megarangers in the form of the wings of Mega Winger to form Wing GoZyuJin and attacks a Zangyack fleet using the Gokai Spartan. Marvelous sends off MagiDragon and summons Variblune to form Goren GokaiOh. They subsequently use the Greater Powers of Dynaman and Jetman to destroy the last of Zangyack ships, leading the Gokaigers to assume they've defeated their enemy.
Unfortunately the Gigant Horse arrives with another wave of ships much to the shock of the Gokaigers, which then open fire on the mechas' support. MagiDragon, Fūraimaru, Pat Striker and GaoLion are all shot down while Machalcon is forced to return to the Machine World. The Gigant Horse then fires its missiles at Goren GokaiOh and Wing GoZyuJin and the two mecha try to outrun them. Wing GoZyuJin flies directly into a missile, causing it to crash into the city where it explodes on impact. Goren GokaiOh is also hit, damaging Variblune as GokaiOh crashes into the city. Inside the cockpit, Marvelous makes sure the others are still alive, however the Gigant Horse fires more missiles which pound directly into the defenseless GokaiOh, destroying it. The Gokaigers are sent flying from the mecha as the flaming Galleon is thrown from the explosion and crashes into a building, causing massive damage. Inside, Navi, protecting the treasure, screams in fear as the control room explodes around him.
On board the Gigant Horse, Dyrandoh wants to destroy the Earth immediately since the Gokaigers were defeated, but Ackdos Gill tells him to wait. He then appears to the populace of Earth, declaring the defeat of the Gokaigers. Ackdos then states that the people of Earth have until the next morning to live, when the Zangyack will start exterminating humanity. The Zangyack invasion force leaves, but Luka wonders how they'll be able to beat their numbers, and Don tells Joe that he can't get the Galleon repaired in time. The Gokaigers remember that they still have the Greatest Treasure in the Universe which has the power to completely wipe out the Zangyack, but contemplate whether they should use it since it will cause all the previous Super Sentai to disappear from existence. Gai then tries to help a woman trapped underneath some rubble, but is unable to completely lift the beam she is trapped under, due to a injured arm. Then, as he dropped it, Sharma Tribe Knight Goushi, the former MammothRanger of the Zyurangers, lends Gai assistance, easily grabbing then tossing aside the steel beam, and lifting a piece of rubble.
In another section of town, Ahim and Luka run into the woman and her daughter Miku that they met when they encountered Matsuri Tatsumi, the former GoPink. The two head for an evacuation shelter with the new child, but are stopped by two Gormin. Miku defends her mother, but as the Gormin aim at the parent and children, they are gunned down by Luka and Ahim. Miku tells them that Matsuri said that sometimes the Super Sentai get scared, but that they are brave when it comes to protecting what they care about.
Don and Joe then run into Shuchirou Amachi helping out an injured child and telling others not to give up as the Super Sentai had gotten out of tougher situations. A woman assisting Shuichirou tells a girl that they can use the magic known as "courage" and that the Super Sentai taught her that it would create a better future, showing them a MagiRed chibi plushie.
In another section, Marvelous notices the boy who stole the Shinken Red key fighting a trio of Gormin. He defeats two, but Marvelous shoots the third when it got back up when the boy's back was turn. The boy acknowledges that he's not strong enough, but that he can still fight despite not being a Super Sentai. He then asks Marvelous if he found any worth in the Earth, and Marvelous says that he did. He recalls the boy's words about the Earth's value being everywhere, and points to the kid's heart and says that it's within him as well. The Gokaigers then reassemble at the downed Gokai Galleon later that night.
On board the wrecked Galleon, the Gokaigers find Navi having safely guarded the Greatest Treasure. In the worst possible scenario, the Gokaigers are outnumbered, unable to use the Galleon or call on any other vessel to assist them. Marvelous picks up the treasure, and Gai says they should use it as that's what the Super Sentai would want. He explains to the rest of the crew that he met Goushi, who explained that the previous 34 teams were only able to send the Zangyack away from Earth, but they all wanted to create a peaceful universe where no one was oppressed by the Zangyack. Goushi told Gai that the Gokaigers had seized their dreams and had the power to accomplish their goals, but Gai told him that they couldn't just wipe out the 34 previous teams, but Goushi tells him that they were ready to die when they faced the Zangyack in the Great Legend War, and that it doesn't matter if the other Sentai die as long as the Zangyack was destroyed.
Gai tells the other Gokaigers that they should use the Greatest Treasure to create a universe without the Zangyack. However, the other Gokaigers decline the chance, and Marvelous says that they have to just destroy the Zangyack themselves. Ahim realized that the people of Earth had grown strong due to the bravery of the Super Sentai, and the others say that destroying the Super Sentai would only take away the new-found courage and they aren't willing to wipe out those who have protected the Earth and then trusted the Gokaigers to do the same. Luka says that she originally wanted to change the past, but she realized that they all lived by accepting what was happening around them. Joe tells Gai that the painful moments in their lives helped to make them the people they are today, and Marvelous doesn't want to live in a boring future that can't be created by their own hands. Gai apologizes to the Super Sentai and declares that he'll grab his dreams by his own hands, and uses the Gokai Spear's Gun Mode to destroy the Greatest Treasure. Marvelous then compliments Gai on talking like a real pirate, declaring him a full-fledged pirate.
The next morning, Dyrandoh arrives with a squad of Gormin soldiers, asking the people to think about the foolishness of rebelling against the Zangyack. The people stand up and declare they won't be defeated easily. Dyrandoh then orders some Gormin to form a firing squad at the crowd. The Gokaigers then appear and shoot down the front line of Gormin, carrying the Gokai Galleon's flag, to the surprise of the civilians. The Gokaigers say they won't listen to the Zangyack and declare their hatred for them. Marvelous declares that they'll risk their lives to protect the Earth and the team transformed to fight the Zangyack. The Gokaigers fight off waves of Gormin and Sugormin.
Two Dogormin fire on the Gokaigers, but Gai changes into DragonRanger to protect them. He then gives the Dragon Armor to Marvelous, changing him into Armed TyrannoRanger, while at the same time transforming Gai back into Gokai Silver. Marvelous then beats the two Dogormin, and the other Gokaigers use their Final Wave attacks to finish them off. The six pirates then glare at the scared Dyrandoh, who demanded to know where they got such power. Marvelous declared himself and his crew the Kaizoku Sentai, as Dyrandoh opens fire at the charging space pirates.
- Captain Marvelous (キャプテン・マーベラス Kyaputen Māberasu): Ryota Ozawa (小澤 亮太 Ozawa Ryōta)
- Joe Gibken (ジョー・ギブケン Jō Gibuken): Yuki Yamada (山田 裕貴 Yamada Yūki)
- Luka Millfy (ルカ・ミルフィ Ruka Mirufi): Mao Ichimichi (市道 真央 Ichimichi Mao)
- Don Dogoier (ドン･ドッゴイヤー Don Doggoiyā): Kazuki Shimizu (清水 一希 Shimizu Kazuki)
- Ahim de Famille (アイム・ド・ファミーユ Aimu do Famīyu): Yui Koike (小池 唯 Koike Yui)
- Gai Ikari (伊狩 鎧 Ikari Gai): Junya Ikeda (池田 純矢 Ikeda Jun'ya)
- Navi (ナビィ Nabyi, Voice): Yukari Tamura (田村 ゆかり Tamura Yukari)
- Fuuraimaru (風雷丸 Fūraimaru, Voice): Hironori Miyata (宮田 浩徳 Miyata Hironori)
- Engine Machalcon (炎神マッハルコン Enjin Mahharukon, Voice): Hiroaki Hirata (平田 広明 Hirata Hiroaki)
- Emperor Ackdos Gill (皇帝アクドス・ギル Kōtei Akudosu Giru, Voice): Shinji Ogawa (小川 真司 Ogawa Shinji)
- Dyrandoh (ダイランドー Dairandō, Voice): Masashi Ebara (江原 正士 Ebara Masashi)
- Goushi (ゴウシ Gōshi): Seiju Umon (右門 青寿 Umon Seiju)
- Miku: Fuu Konishi (小西風優 Konishi Fuu)
- Miku's mother: Ayumi Yamaguchi (山口 あゆみ Yamaguchi Ayumi)
- Unnamed boy: Daichi Izumi (泉 大智 Izumi Daichi)
- Professor Shuichiro Amachi (天知秀一郎 Amachi Shūichirō): Louis Yamada LIII (山田ルイ53世 Yamada Rui Gojūsan-sei)
- Yuka Yamazaki (山崎 由佳 Yamazaki Yuka): Kaoru Hirata (平田 薫 Hirata Kaoru)
- Gokai Changes in The Day of Battle:
- This is the only time a Gokaiger transforms into a past Sentai Warrior without the need of a Ranger Key. In this case, Marvelous just becomes TyrannoRanger and then uses the Dragon Armor given to him by Gai, as DragonRanger, to become Armed TyrannoRanger.
- This is the last episode where Joe, the girls and Don don't transform into any past Sentai Warriors.
- Overall, this is the last television episode where the entire Gokaiger team does not transform into past Sentai Warriors together.
- As part of Super Hero Time, this episode aired alongside Kamen Rider Fourze episode 22, True Self Dismissal.
- With this episode, two milestones have now occurred in the series:
- At least one actor from all 34 past Super Sentai series who has played a Ranger has reprised their role.
- Every Power Rangers-adapted Sentai teams' Greater Power has been used.
- Despite Marvelous and Gai becoming Armed TyrannoRanger and DragonRanger, as well as Goushi (MammothRanger)'s reappearence, this can't fully be considered a Zyuranger tribute, due to the others not transforming into the other Zyurangers nor did they do a Gokai Change similar to the transformation fashion of the Zyurangers.
- Several Greater Powers premiere in this episode, including the TV premiere of the Gorenger's Greater Power, Goren GokaiOh (earned way back in Gokaiger Goseiger Super Sentai 199 Hero Great Battle) as well as the first appearance of the Greater Powers of Dynaman (also gained in 199) and the Megarangers (earned in Ep. 39: Why? We're High School Students).
- Joe, the girls and Don's defiance towards Dyrandoh upon the crew's return is a callback to what they said to the Action Commander in the first episode. Luka says "Shut up, idiot.", Joe says that the Zangyack will be the ones to get lost, Ahim says that they have no intention of listening to them, and Don says that he (and everyone else on this planet) hates guys like them.
- Goushi's first appearance in this episode involves him helping to save a mother trapped under rubble, so that she and her child can escape. This is a reference to Zyuranger, in which the majority of the episode's plotlines involved saving kids from Bandora's evil schemes.
- Final appearance of GokaiOh, GoZyuJin, and the Legend Mecha until Tokumei Sentai Go-Busters vs. Kaizoku Sentai Gokaiger: The Movie (excluding the Legend Mecha).
- Armed Tyrannoranger's Dino Buckler was silver plated instead of gold.
Kaizoku Sentai Gokaiger Volume 12 features episodes 47-51: Ep. 47: The Limits of Betrayal, Ep. 48: The Fated Showdown, Ep. 49: The Greatest Treasure in the Universe, Ep. 50: The Day of Battle, and Final Ep.: Farewell Space Pirates. It was released on June 21, 2012. 
- The Wrath - Power Rangers counterpart in Super Megaforce. See comparison page.
- Legendary Battle - Power Rangers counterpart in Super Megaforce. See comparison page.
- The Legendary Battle: Extended Edition - Power Rangers counterpart in Super Megaforce. See comparison page.