Masao Den

"Battle Japan!"

Masao Den (伝正夫, Den Masao) is Battle Japan of Battle Fever J. He is a former National Defense Ministry officer.

Battle Fever
He is good at judo and karate. He is armed with a spear. He does a kung fu dance.

Turboranger
Masao and his team joined up with the other nine Sentai to stand behind the newest Sentai, the Turborangers, as they faced off against the Hundred Boma Tribes.

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.

Gokaiger
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.

Mecha

 * Battle Shark (shared with Cossack, France, Kenya, and America)
 * Battle Fever Robo (shared with Cossack, France, Kenya, and America)

Arsenal

 * Battleciever
 * Command Bat → Spear

Ranger Key
The Battle Japan Ranger Key (バトルジャパンレンジャーキー) 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.