|This article is about a/an episode in Kamen Rider Gaim.|
Great Ball Watermelon, Big Bang! (大玉スイカ、ビッグバン！ Ōdama Suika, Biggu Ban!) is the seventh episode of Kamen Rider Gaim. It features the debut of Gaim Suika Arms, notably its Yoroi and Odama Modes, and the debut of Kamen Rider Duke.
After easily defeating both Kurokage and Gridon, Kamen Rider Bravo steals their Lockseeds and sets his sights on defeating all of the Armored Riders. Kouta is angered that Oren has made it his mission to defeat all of the Armored Riders, but Kaito just tells him to beat him to get it over with. Before long, Bravo issues a challenge to Baron, but it is not Baron who he is really after.
After easily defeating both Kurokage and Gridon, Kamen Rider Bravo stole their Lockseeds and set his sight on defeating all of the Beat Rider Player's team, which he said in an interview in the Beat Rider Hotline. Kouta was angered that Oren had made it his mission to defeat all of the Armored Riders, but Kaito just told him to beat him to get it over with.
Somewhere in Yggdrassil Corporation, Takatora, along with his subordinates, Lock Dealer Sid, DJ Sagara and the creator of the Sengoku Driver, Ryoma Sengoku, arranged a meeting to discuss Oren's profile, the Lockseeds and Sengoku Drivers.
Before long, Bravo issued a challenge to Baron and defeated him along with his summoned Inves. Oren then returned Kaito's Banana Lockseed, stating that Baron was a worthy opponent, but needed to train more to become more powerful and Oren would wait for the right time to challenge him.
During Team Gaim's Stage Show, Oren appeared for a challenge against Mitch. Kouta came in to aid Mitch due how strong Oren was, they transformed and battle. When Gaim and Ryugen are knocked down, Bravo unleashes a large number of Inves who go on rampage around Zawame City (As Oren is unaware of the consequences of dropping a Lockseed while an inves is summoned). Due to Oren's mistake, Kouta and Mitch were saving everyone and had a hard time of it until Mitch gives Kouta the Suika Lockseed to transform into the gigantic Suika Arms. At first, he thought that Kouta was unable to handle the giant armor with no choice to transform and he would be crushed by it; however, Kouta was fine and was able to control the armor into different modes, thus destroying the rampaging Inves and knocking Oren out.
However, one remaining Inves survived, it eats all of Bravo's dropped Lockseeds and changed into a massive form, and escaped to wreck the city. The Inves is then destroyed with Sojinto Razor finisher attack, until Bravo appeared as the Riders needed to settle their fight. However, Bravo's time was up and must leave to work, not before telling Kouta and Mitch to remember their unfinished fight. When Team Gaim went to 1st rank, Mai brought a cake from Charmant again to celebrate their victory, but Kouta, even though he's excited about the cake for a short while, still despised Oren.
- Kouta Kazuraba (葛葉 紘汰 Kazuraba Kōta): Gaku Sano (佐野 岳 Sano Gaku)
- Kaito Kumon (駆紋 戒斗 Kumon Kaito): Yutaka Kobayashi (小林 豊 Kobayashi Yutaka)
- Mitsuzane Kureshima (呉島 光実 Kureshima Mitsuzane): Mahiro Takasugi (高杉 真宙 Takasugi Mahiro)
- Mai Takatsukasa (高司 舞 Takatsukasa Mai): Yuumi Shida (志田 友美 Shida Yuumi)
- Takatora Kureshima (呉島 貴虎 Kureshima Takatora): Yuki Kubota (久保田 悠来 Kubota Yūki)
- Chucky (チャッキー Chakkī): KANON
- Rica (リカ Rika): MIINA
- Rat (ラット Ratto): Ren Ozawa (小澤 廉 Ozawa Ren)
- Hideyasu Jonouchi (城之內 秀保 Jyonouchi Hideyasu): Ryō Matsuda (松田 凌 Matsuda Ryō)
- Ryoji Hase (初瀬 亮二 Hase Ryōji): Atsushi Shiramata (白又 敦 Shiramata Atsushi)
- Ryoma Sengoku (戦極 凌馬 Sengoku Ryōma): Tsunenori Aoki (青木 玄徳 Aoki Tsunenori)
- Oren Pierre Alfonzo (凰蓮・ピエール・アルフォンゾ Ōren Piēru Arufonzo): Metal Yoshida (吉田 メタル Yoshida Metaru)
- Lock Dealer Sid (錠前ディーラー シド Jōmae Dīrā Shido): Kazuki Namioka (波岡 一喜 Namioka Kazuki)
- DJ Sagara (DJサガラ Dī Jei Sagara): Tomomitsu Yamaguchi (山口 智充 Yamaguchi Tomomitsu)
- Sengoku Driver Equipment Voice (戦極ドライバー各種アイテム音声 Sengoku Doraibā Kanren Aitemu Onsei): Seiji Hiratoko (平床 政治 Hiratoko Seiji)
- Narration (ナレーション Narēshon): Hōchū Ōtsuka (大塚 芳忠 Ōtsuka Hōchū)
- Iyo (イヨ): Yui Natsuki (那月 結衣 Natsuki Yui)
- Fans: Hisashi Aoyama (青山 久志 Aoyama Hisashi), Tomohiro Wada (和田 朋丈 Tomohiro Wada), Kennosuke Kishi (岸 健之助 Kishi Kennosuke)
- Lock Used:
- Orange, Suika
- Budou, Sakura Hurricane
- Arms Change:
- Lock Vehicle:
- As part of Super Hero Time, this episode aired alongside Zyuden Sentai Kyoryuger episode 38 Brave 38: Love Touch! The Most Beautiful Zorima.
- Viewership: 5.8%
- Closing Screen Lockseed Collection:
- This is the first episode that doesn't introduce a new Rider.
- However, Ryoma Sengoku, who later becomes Kamen Rider Duke, does appear for the first time.