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The Forbidden Words (禁じられた言葉 Kinji Rareta Kotoba) is the thirty-third episode of Ultraman. It marks the first appearance of the iconic alien, Alien Mefilas.


Alien Mefilas kidnaps SSSP memebers Shin Hayata, and Akiko Fuji, as well as Fuji's younger brother, Satoru. Mefilas attempts to convince the child, Satoru, to give him the ownership of the planet Earth, in exchange Mefilas offers Satoru to live on another world that is without war and sickness. However Satoru refuses, saying that he is an Earthling and will only be happy living on Earth. Shin Hayata mocks Mefilas, and has exposed the Beta Capsule, his transformation artifact. But Mefilas paralyzes him before he can depress its ignition button with his right thumb.

Alien Mefilas begins his attempt to make the world's leaders give into his demands by enlarging SSSP member Fuji to a gigantic size, and uses her to hold a city at ransom. As a further demonstration of his power, he summons illusions of Alien Baltan, Alien Zarab, and Kemur. However, the Science Patrol learn the location of Alien Mefilas's starship and the Japanes Defense force begins to attack the malicious alien. Mefilas retaliates, but he is forced to retreat. Science Patrol members rescue Fuji and Hoshino, leaving Hayata behind.

The rumble of the ships destruction causes the paralyzed Hayata to fall over, causing his raised Beta Capsule to flash. Ultraman faces off against Mefilas, the two, however, prove evenly matched. Mefilas calls of their battle seeing no need to fight against each other. Mefilas accepts his defeat by Earth and even the child Satoru, however the alien vows that he will someday return, and vanishes. Leaving Hayata to rejoin the other SSSP members and congratulates Satoru for his courage.


Voice Actors

Suit Actors

  • Ultraman (ウルトラマン Urutoraman): Bin Furuya (古谷 敏 Furuya Bin)
  • Alien Mefilas (メフィラス星人 Mefirasu Seijin): Koji Ogi (扇 幸二 Ōgi Kōji)





"What's so funny, Ultraman?"
"Mefilas, your guess was completely wrong. No human would sell the Earth. Even a child like Satoru, wants to do good things for the Earth, and would never throw it away!"
"Shut up! What are you Ultraman? Are you an alien, or a human?"
"I am both. I was born to fight those who break universal laws, like you."
"Don't kid yourself. I will make this beautiful planet my own."
"Mefilas, I won't let you.

―Alien Mefilas I and Ultraman in Mefilas I's Space ship

"Alien Mefilas, go home to your own planet at once."
"You spy."
"Let's go!

―Ultraman's and Alien Mefilas I's final words before their battle

"Let's stop. Ultraman, there's no use in two aliens fighting each other. I only wanted the heart of the Earth. But, I have lost. I even lost to a child. However this does not mean I have given up. There must be someone that will give me the Earth. They will come to me!"

―Alien Mefilas I ending his battle with Ultraman

Home Media

  • Ultraman Volume 9 features episodes 33-36.


  • This is the only time Masao Nakasone voiced Ultraman in both speaking voice and grunts.
  • This episode was later featured in Ultraman Retsuden episode 84 "The Forbidden Word! Alien Mefilas's Challenge!!."
Ultraman Episodes
The Birth of Ultraman | Ultra Operation No.1 | Shoot the Invaders! | Science Patrol, Move Out | Five Seconds Before the Explosion | Secret of the Miloganda | The Coast Guard Command | The Blue Stone of Baradhi | The Lawless Monster Zone | Lightning Operation | The Mysterious Dinosaur Base | The Rascal from Outer Space | Cry of the Mummy | Oil S.O.S. | The Pearl Defense Directive | Terrifying Cosmic Rays | Science Patrol Into Space | Passport to Infinity | Brother from Another Planet | Demons Rise Again | Terror on Route 87 | Breach the Wall of Smoke | Overthrow the Surface | My Home Is Earth | The Undersea Science Center | Mystery Comet Tsuifon | The Prince of Monsters: Part 1 | The Prince of Monsters: Part 2 | Human Specimens 5 & 6 | The Challenge Into Subterra | Phantom of the Snow Mountains | Who Goes There? | The Endless Counterattack | The Forbidden Words | Present from the Sky | The Monster Graveyard | Don't Shoot, Arashi! | The Little Hero | The Spaceship Rescue Command | Farewell, Ultraman