TV Transformers: The Headmasters - Season 1 Episode 9 : Seibertron is in Grave Danger (1) Transformers: The Headmasters - Season 1 Episode 9 : Seibertron is in Grave Danger (1) 7.6/10 by 14 users On Seibertron, once again at peace thanks to Vector Sigma, a new compound has been created called Seibertonuron which is many times stronger than Seibertonium. The Destron cassettes find out about it and Soundblaster reports to Galvatron, telling him that the new compound allow him to defeat the Cybertrons. Meanwhile, back on Earth, the Headmasters are working out to keep up their conditioning. Galvatron sends the Predacons to retrieve the compound while the rest of the Destrons head to their new base. The Destron Headmasters and Sixshot meet with the shadowy Scorponok to discuss their next moves while the Cybertron Headmasters arrive at the Destron base. The Combaticons, Stunticons and Destron Headmasters then arrive on Seibertron with Galvatron and wreck havoc on the planet. Fortress and the Headmasters then head to Seibertron with Rodimus, Cha, Blurr and Arcee. They manage to drive back the Destrons - Guardian beating Bruticus, Superion beating the Stunticons, and the Cybertron Head Details Casts Posters Images Title Transformers: The Headmasters - Season 1 Episode 9 : Seibertron is in Grave Danger (1) Alternative Titles Transformers Headmasters, Transformers The Headmasters First Air Date 1987-07-02 Last Air Date 1988-04-25 Number of Episodes 35 Number of Seasons 1 Genres Animation, Sci-Fi & Fantasy, Action & Adventure, Networks Nippon TV, Casts Ikuya Sawaki, Tomiko Suzuki, Hideyuki Hori, Ryoichi Tanaka, Masato Hirano, Michitaka Kobayashi, Hochu Otsuka, Masaharu Sato Plot Keywords , Fortress Maximus Ikuya Sawaki Daniel Witwicky Tomiko Suzuki Chromedome Hideyuki Hori Brainstorm Ryoichi Tanaka Hardhead Masato Hirano Highbrow Michitaka Kobayashi Crosshairs Hochu Otsuka Sureshot Masaharu Sato Episodes List Transformers: The Headmasters Season 1 :Episode 1 Four Warriors Come Out of the Sky (1) Four Warriors Come Out of the Sky (1) 1987-07-02 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 2 The Mystery of Planet Master (2) The Mystery of Planet Master (2) 1987-07-09 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 3 Birth of Double Convoy! (3) Birth of Double Convoy! (3) 1987-07-16 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 4 Operation: Cassette Operation: Cassette 1987-07-23 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 5 Rebellion on Planet Beast Rebellion on Planet Beast 1987-07-30 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 6 Approach of the Demon Meteorite Approach of the Demon Meteorite 1987-08-06 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 7 The Four Million Year Old Veil of Mystery The Four Million Year Old Veil of Mystery 1987-08-27 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 8 Terror of the Six Shadows Terror of the Six Shadows 1987-09-03 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 9 Seibertron is in Grave Danger (1) Seibertron is in Grave Danger (1) 1987-09-04 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 10 Seibertron is in Grave Danger (2) Seibertron is in Grave Danger (2) 1987-09-11 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 11 Scorponok, The Shadow Emperor Scorponok, The Shadow Emperor 1987-09-18 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 12 The Dormant Volcano Mysteriously Erupts The Dormant Volcano Mysteriously Erupts 1987-09-25 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 13 Head On, Fortress Maximus Head On, Fortress Maximus 1987-10-02 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 14 Explosion on Mars!! Maximus is in Danger! (1) Explosion on Mars!! Maximus is in Danger! (1) 1987-10-09 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 15 Explosion on Mars!! Megazarak Appears! (2) Explosion on Mars!! Megazarak Appears! (2) 1987-10-16 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 16 The Return of the Immortal Emperor The Return of the Immortal Emperor 1987-11-20 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 17 SOS From Planet Sandra SOS From Planet Sandra 1987-11-27 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 18 Daniel's Biggest Pinch Ever!! Daniel's Biggest Pinch Ever!! 1987-12-04 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 19 Battle to the Death on the Beehive Planet Battle to the Death on the Beehive Planet 1987-12-11 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 20 Tide-Turning Battle on the False Planet Tide-Turning Battle on the False Planet 1987-12-18 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 21 Find Megazarak's Weak Spot Find Megazarak's Weak Spot 1987-12-18 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 22 Head Formation of Friendship Head Formation of Friendship 1987-12-18 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 23 Mystery of the Space Pirate Ship Mystery of the Space Pirate Ship 1987-12-25 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 24 The Death of Ultra Magnus (1) The Death of Ultra Magnus (1) 1988-01-22 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 25 The Emperor of Destruction Vanishes on an Iceberg (2) The Emperor of Destruction Vanishes on an Iceberg (2) 1988-01-29 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 26 I Risk My Life for Earth I Risk My Life for Earth 1988-02-05 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 27 The Miracle Warriors- The Targetmasters (1) The Miracle Warriors- The Targetmasters (1) 1988-02-12 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 28 The Miracle Warriors- The Targetmaster (2) The Miracle Warriors- The Targetmaster (2) 1988-02-19 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 29 The Master Sword is in Danger The Master Sword is in Danger 1988-02-26 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 30 The Zarak Shield Turns the Tide The Zarak Shield Turns the Tide 1988-03-04 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 31 Operation: Destroy the Destrons Operation: Destroy the Destrons 1988-03-11 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 32 My Friend Sixshot! My Friend Sixshot! 1988-03-18 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 33 Duel on the Asteroid Duel on the Asteroid 1988-03-25 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 34 The Final Showdown on Earth (1) The Final Showdown on Earth (1) 1988-04-25 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise. Transformers: The Headmasters Season 1 :Episode 35 The Final Showdown on Earth (2) The Final Showdown on Earth (2) 1988-03-25 Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise.