Gridman Sigma
Human Host/Form: Takeshi Todo
Height: Micro ~ 70 m
Weight: 0 ~ 56,000 t
Place of Origin: Hyper World
Transformation Item: Grand Acceptor
Type: Hero
Voice actor(s): N/A
Suit actor(s): N/A
First Appearance: Denkou Choujin Gridman: boys invent great hero
Last Appearance: None
Race: N/A
Status: Never Created
Affiliation: N/A

Gridman Sigma (グリッドマンシグマ Guriddoman Shiguma) was the proposed ally of Gridman in a sequel series that was never completed or even aired. Sigma would have become the alter ego of Takeshi Todo, a reformed antagonist of the original series. Sigma would have fought a relative of Khan Digifier.

In 2015, Gridman Sigma made his first public appearance in the anime short, Denkou Choujin Gridman: boys invent great hero where he is finally partnered with Takeshi Todo.


Denkou Choujin Gridman: boys invent great hero

Anime Sigma

Takeshi appeared as an adult in the anime Gridman short. After watching the battles of the previous Gridman, Takeshi is granted a transformation device by the light of several monitors and transforms by shouting 'ACCESS FLASH'. Transforming into Gridman Sigma to face two monsters in the real world.



  • Height: Micro ~ 70 m
  • Weight: 0 ~ 56,000 t
  • Flight Speed: Mach 30
  • Origin: Hyper World





  • Sigma's blue design would be later used in many other Ultras.
  • His face resembles the faces of Jean-Bot and Jean-Nine .
  • The reason he has no history or stats is because he never made it on screen since his series was cancelled before development could be made on the character.

Other Heroes
Showa Heroes

Mirrorman | Falcon | Redman | Red Fighter | Green Fighter | Orange Fighter | Triple Fighter | Jumborg Ace | Jumborg 9 | Fireman | Izenbo | Koseidon
Heisei Heroes

Gridman | Servo | WoO | Mirrorman Reflex | Gridman Sigma | Don Shine
Ally Heroes

God Zenon | Dyna Dragon | Mountain Gulliver No. 5 | Reimon | Mirror Knight | Glen Fire | Jean-Bot | Jean-Nine | War God