Rage! The Sleeping Giant, Spartan!

"Rage! The Sleeping Giant, Spartan!" it's the 14th episode of Mazinger Z. This episode first aired in Japan on March 4, 1973.

Summary
Dr. Hell and Baron Ashura are watching a battle between Spartan K5 and Modilus. Although the former shows impressive power, it won't attack unless provoked which angers Hell. He's about to have Spartan destroyed when Ashura intervenes. He persuades Dr. Hell into letting him take K5 to attack the city.

Koji and his friends are celebrating Shiro's birthday when the Photon Power Lab calls to inform them about the Mechanical Beast. Mazinger Z and Aphrodite A are sent to deal with it.

After Spartan K5 doesn't show any hostile intetion, Koji and Sayaka leave it alone. As a result, the media mocks Dr. Hell for sending a Mechanical Beast unwilling to fight. Furious, he orders Baron Ashura to have Spartan K5 destroyed. A team of Iron Masks are sent to plant explosives in the mechanical beast's joints.

The next day, Shiro, Boss, Nuke and Mucha go visit a still sleeping Spartan. They start playing a drum Shiro received as a birthday present which prompts K5 to go beserk. Mazinger Z and Aphrodite A arrive just in time to save their friends.

Koji and Sayaka try, but are unable to reason with him. After a brutal fight, Spartan defeats both robots and is about to finish of Mazinger Z when the explosives inside him go off. Koji and his friends mourn the fallen Mechanical Beast as they do believe Spartan did love peace.

Recurring

 * Koji Kabuto
 * Sayaka Yumi
 * Shiro Kabuto
 * Gennosuke Yumi
 * Dr. Hell
 * Baron Ashura
 * Boss
 * Nuke
 * Mucha

Machines

 * Mazinger Z
 * Hover Pilder
 * Aphrodite A
 * Spartan K5
 * Modilus

Weapons

 * Breast Fire
 * Rocket Punch
 * Missile Punch

Trivia

 * Spartan K5 is the first Mechanical Beast to give Mazinger Z trouble. Not only he managed to withstand all of Z's attacks and destroy one of his arms, but Spartan would have won the battle if the Iron Masks hadn't rigged him with explosives.