Terrifying Cosmic Rays
Ultraman, Episode 15
Ultraman vs Gavadon
Air date 10/23/1966
Screenplay by Mamoru Sasaki
Directed by Akio Jissoji
Special skill director Koichi Takano
The Pearl Defense Directive
Science Patrol Into Space
Watch on Hulu

Terrifying Cosmic Rays (恐怖の宇宙線 Kyōfu no Uchūsen) is the 15th episode of Ultraman. On the DVD release it is only called The Space Ray of Terror.


An unusual form of space radiation turns a child's chalk sketch into a real-life giant monster that's all but impervious to the Science Patrol's attacks.



Ultra Warriors


  • Gavadon (First and only appearance)
    • A
    • B


"Don't cry, children. You can see Gavadon once a year once a night among the stars in the sky."


DVD Release

  • Ultraman Volume 4 Features Episodes 13-16.
  • Ultraman Complete Series Features All Episodes.


  • This episode later featured in New Ultraman Retsuden episode 36 "Terrifying Cosmic Rays: Birth of Gavadon."
Ultraman Episodes
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 Baraji |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 Typhoon | 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
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