Thunder Gei (サンダーゲイ Sandā Gei?) is a kaiju that appears in The Tv Series: Spectreman, in episodes 17 and 18.

Subtitle: Cyborg Monster (サイボーグ怪獣 Saibōgu Kaijū?)


  • Lightening Bolts: Thunder Gei can launch bolts of countless volts of electricity from its massive mouth.
  • Electrical Shocks: When an opponent gets too close, Thunder Gei can generate massive amounts of electricity and surge it through its body to shock them.
  • Mimicry: Thunder Gei’s primary means of attack is mimicry, thus it will copy an opponent’s move, gaining it such powers as size changing to match whatever its opposition does.
  • Invisibility: With the ability to wrap itself in invisible waves that reflect the light spectrum of Earth, Thunder Gei can attack without warning.
  • Flight: Thunder Gei can fly.
  • Size Change: Thunder Gei can change its size just like Spectreman.


Created by Dr. Gori, Thunder Gei attacked the ships around the Sea of Japan with little remorse. Attacking like a phantom, the creature crippled Japan’s fishing business. So it wasn’t long before Jouji transformed into Spectreman, and took on Dr. Gori’s latest threat. Using his Spectral Eyes, the warrior spotted the whale and immediately set out after it. each time he neared the creature, it flung him back to Earth; thanks to its electrical waves. Eventually though, Spectreman was able to blast the creature out of the sky, sending it crashing into the ocean.

During their second battle, Spectreman finally was able to discover the whale’s weakness. The creature would mimic his moves. If he shrank in size, so would the monster. If he drained his strength and lay still, so would Thunder Gei. Dr. Gori, angered by his creature’s weakness, sent Karas to kill Spectreman in his weakened condition. The man ape attacked viciously, as Spectreman was forced to remain still and take it. Meanwhile, the Pollution Control team was putting a bomb inside the whale, as it laid still. Once they had finished they blew the creature up, leaving Spectreman now with the opportunity to whoop Karas once again!

Spectreman MangaEdit


Thunder Gei reappears in the Spectreman Manga rampaging in cities creating earthquakes and tsunamis.


  • In the manga Thunder Gei appears with armor on his head and two large teeth.

Figure Release InformationEdit

Spectreman Kaiju and Aliens
HedoronBakulahDeceitmanDust ManGilagindGokinosaurusKuruma-NikurasBaronsaurusMagulahMidoronMitsu Kubi RyuMogunetudonMogzNeo HedoronNezubirdonSalamandarSatan KingSilver RoboSpincobraThunder GeiZariganidZeronVegaronSphinxSphinx-Beast

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