The Devil's Giant Rolling Attack!!

"The Devil's Giant Rolling Attack!!" it's the 13th episode of Mazinger Z. This episode first aired in Japan on February 25, 1973.

Summary
Koji and his fellow students are taking part in a snow sculpture contest being held by their school. Ashura becomes aware of the fact through Saluud's video feed which is streaming Koji's current location. As the boy seems to be distracted, Baron Ashura sends outs Goronko S2 disguised as a giant snowball to the city.

The Photon Power Lab's radar is able to pick up the Mechanical Beast's signal. In response, Aphrodite A is dispatched to investigate the unidentified object approaching the city. Goronko starts jamming their radars making Sayaka unable to locate it midset the snow covered cities.

Mistaking the Mechanical Beast for a real snowball, Nuke and Mucha take it to Boss to use it as foundation for their snow sculpture. As Koji and his team have almost finished their work, Boss urges his underling to hurry up.

Shiro arrives and tells his brother about the unidentified object. Koji abandons the competition. After realizing what happened, Ashura orders Goronko to start attacking. The Mechanical Beast's movements destroy Boss' sculture who chases after the snow ball.

Although they are unable to catch up to Goronko, Boss and his gang meet with Sayaka. They fill her in and warn about the possibility of the snowball being a disguised Mechanical Beast.

Koji arrives back at his house with Shiro and calls the Photon Power Lab to ask about what the situation. Seeing this, Ashura sends a few Iron Masks to prevent him from deploying in Mazinger Z. After defeating them, Koji boards the Hover Pilder.

Aphrodite A locates Goronko S2 and attacks it. She gets defeated, but Mazinger Z's able to destroy the Mechanical Beast.

The battle is won, but not without a cost. The boys exceed the time limit to finish their sculptures and end up being disqualified from the contest.

Recurring

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

Machines

 * Mazinger Z
 * Hover Pilder
 * Goronko S2
 * Aphrodite A

Weapons

 * Oppai Missile
 * Breast Fire
 * Rocket Punch
 * Koushiryoku Beam
 * Rust Hurricane