Pursue the Mystery of the Transformation Terrible-Monster (変身超獣の謎を追え Henshin Chōjū no Nazo o Oe!) is the 6th episode of Ultraman Ace.


An astronaut named Koyama returns to Earth to his wife and son, but is waylaid by Yapool and his latest creation, Brocken. TAC helps Koyama bring his spaceship in safely, not realizing that he has been possessed by Brocken. Koyama goes home to his son, who notices that his father hasn't removed his gloves.


Guest Stars

  • Akira Koyama (小山彰 Koyama Akira): Akiji Kobayashi (小林 昭二 Kobayashi Akiji)

Suit Actors

  • Ultraman Ace (ウルトラマンエース Urutoraman Ēsu) Tadashi Nakanishi (中西正 Nakanishi Tadashi)
  • Brocken ((ブロッケン Burokken): Toru Kawai (河合 徹 Kawai Tōru)




Home Media

  • Ultraman Ace Volume 2 features episodes 5-8.


Ultraman Ace Episodes
Shine! The Five Ultra Brothers | Beyond the Giant Terrible-Monster | Burn! Terrible-Monster Hell | 30,000 Year Terrible-Monster Appears | Giant Ant Terrible-Monster vs. Ultra Brothers | Pursue the Mystery of the Transformation Terrible-Monster | Kaiju vs. Terrible-Monster vs. Alien | Life of the Sun, Life of Ace | 10,000 Terrible-Monsters! Surprise Attack Plan | Decisive Battle! Ace vs. Hideki Go | The Terrible-Monster Is Ten Women? | The Red Flower of Cactus Hell | Execution! The Five Ultra Brothers | The Five Stars that Scattered Throughout the Galaxy | Summer of Horror Series - Curse of the Black Crab | Summer of Horror Series - Ghost Story! Cow God Man | Summer of Horror Series - Ghost Story! The She-Devil of Firefly Field | Lend Me the Pigeon | Mystery of the Kappa's Residence | The Star of Youth, the Star of a Couple | I Saw the Phantom of a Heavenly Woman | Yapool, Demon of Revenge | Reversal! Zoffy Now Arrives | Look! A Giant Transformation in the Middle of the Night | The Pyramid Is a Terrible-Monster's Nest! | Total Annihilation! The Five Ultra Brothers | Miracle! The Father of Ultra | Farewell Yuko, Sister of the Moon | The Sixth Ultra Brother | The Ultra Star That Even You Can See | From Seven to the Hand of Ace | With a Prayer upon the Ultra Star | Shoot That Hot-Air Balloon | A Terrible-Monster Dances on a Sea of Rainbow | A Gift from Zoffy | This Terrible-Monster Has 10,000 Phones? | The Star of Friendship Forever | Resurrection! The Father of Ultra | The Life of Seven! The Life of Ace! | Give Back the Panda! | Winter of Horror Series - Ghost Story! Lion Drum | Winter of Horror Series - Mystery! The Resurrection of the Monster Woo | Winter of Horror Series - Ghost Story! The Cry of the Abominable Snowman | Setsubun Ghost Story! The Shining Bean | Big Pinch! Save Ace! | Ride Beyond the Time Machine | Curse of the Salamander | The Revenge of Verokron | The Flying Jellyfish | Mass Chaos in Tokyo! Traffic Signals Gone Haywire | Life-Sucking Sound | Tomorrow's Ace Is You!
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