|This article is about a/an ranger in Battle Fever J.|
|Sentai Show:||Battle Fever J|
|First Appearance:||Assault!! Run to the Ballpark|
|Last Full Appearance:||Great Legend War|
|Number of Episode Appearances:||52|
Full list of appearances
Masao Den (伝正夫, Den Masao) is Battle Japan of Battle Fever J. He is a former National Defense Ministry officer.
He is good at judo and karate. He is armed with a spear. He does a kung fu dance.
Gaoranger vs. Super Sentai
Led by his Liveman successor Red Falcon, he appeared as one of 24 previous Red Rangers in Gaoranger vs. Super Sentai together with fellow Red Rangers from his predecessors AkaRanger and Spade Ace to his successors from DenziRed to TimeRed.
Years later, Den fought alongside not only his own team, but every single Sentai ranger in existence, against the Empire of Zangyack when it attacked the Earth in the Great Legend War. After fighting against hundreds of Gormin and their Zgormin commanders. Kaijou noticed the fleet moving towards them, he gathered all the Rangers together and gave them the order to sacrifice their powers to wipe out the first invasion's armada. The Battle Japan powers are later utilised by Captain Marvelous via the Ranger Keys. He gets his powers back when the Gokaigers return the Keys.
Super Hero Taisen
Masao, alongside his team, among the majority of the Super Sentai heroes, was caught up in the "Super Hero Taisen" incident which eventually resulted in the Super Sentai teams and Kamen Riders joining forces to defeat both Dai-Zangyack and Dai-Shocker.
- Battle Shark (shared with Cossack, France, Kenya, and America)
- Battle Fever Robo (shared with Cossack, France, Kenya, and America)
Battle Japan wears a white suit with a red stripe that runs along the side around his arms and legs. His gloves and boots are both red in color accentuated with a white scarf. He wears a red belt with a metal buckle and the letter "J" on it, which stands for "Japan". A shield on his chest possesses the "Hinomaru", a red circle which represents the sun on the Japanese flag; this also represents the number "1" in representing the team. His mask is red completely covering most of his face with sculpted hair outside two "eyes" which are similar in form to the masks of Gorenger and Battle Fever. Beneath the red mask is a semi-circle in gray with a sculpted nose and mouth.
The Battle Japan Ranger Key (バトルジャパンレンジャーキー Batoru Japan Renjā Kī?) is Masao Den's personal Ranger Key and what became of his powers after he along with the rest of the 34 Super Sentai sacrificed their powers to end the Great Legend War.
This key along with the majority of the Ranger Keys were collected by the Red Pirates and later used by the Gokaigers. The Battle Japan Ranger Key was mainly used by Captain Marvelous (Gokai Red), who used it to fight as Battle Japan.
- When the Gokaigers became Battle Fever to use the Penta Force cannon to defeat the Combined Combatant.
- When the Gokaigers became Battle Fever to fight against the Ugatz in Gunman World. They finally finished off a group of Ugatz with the Penta Force boomerang.
- When the Gokaigers became Battle Fever in their fight against Action Commander Bibaboo.
- While fighting against Kamen Rider Decade who had transformed into Kamen Rider Hibiki.
After Zangyack were finally defeated, the Gokaigers gave the Ranger Keys back to their rightful owners. It is presumbed that Masao received his key and became Battle Japan once more.
As the third Red, Battle Japan's Red Warrior Spirit was embodied by AkaRed.
- Until Kakuranger, Masao was technically the first Super Sentai Red, as the first two Super Sentai series, Gorenger and JAKQ, were not officially part of the Super Sentai series until Toei included them when Ohranger was announced. Akarenger of Gorenger is now the first Red.
|Hyakujuu Sentai Gaoranger|
|Kakeru Shishi - Gaku Washio - Kai Samezu - Soutarou Ushigome - Sae Taiga - Tsukumaro Oogami|
|Tetomu - Kaito - Princess Iriya - Charcoal Grill Org - Ninpuu Sentai Hurricaneger|
|Soukichi Banba - Yuusuke Amamiya - Miku Imamura - Gouki - Daimon Tatsumi - Tsuyoshi Kaijou - Gorou Sakurai - Masao Den - Ippei Akagi - Takayuki Hiba - Ken'ichi Akama - Hokuto Dan - Shirou Gou - Hiryuu Tsurugi - Jin - Takeru - Riki Honoo - Gaku Hoshikawa - Ryuu Tendou - Yamato Tribe Prince Geki - Ryo of the Heaven Fire Star - Sasuke - Gorou Hoshino - Kyousuke Jinnai - Kenta Date - Ryouma - Matoi Tatsumi - Tatsuya Asami|