|Denkou Choujin Gridman: boys invent great hero|
|Created by:||Tsuburaya Productions|
|Country Of Origin||Japan|
|Number Of Episodes||TBA|
|Original Air Date||16th May 2015|
|Preceded by||Denkou Choujin Gridman|
The entire short took place in 22 years after Gridman's final battle with Khan Digifer. Takeshi Todo, a former brainwashed servant of Khan, reflects on the past incidents as monster attacks took place in real life. Using the Acceptor, he transforms into Gridman Sigma before facing the monster.
22 years ago... A boy, Takeshi Todo, who attempted to take over the world with the devil of the computer world together. He reformed himself after the battle and now needs the power of the hyper agent. Again, the evil is going to appear in the real world. A materialized monster is now approaching! Enter the battle code! The access code is..."GRIDMAN"
- Takeshi Todo
- Character design: Yusuke Yoshigaki
- Key Animator: Akira Amemiya, Yusuke Yoshigaki
- In-between Animation checker: Nahoko Kosugi, Yoshie Endo
- In-between Animator: Kana Yamaguchi, Yukina Kai, Mayumi Nakamura, Takeshi Ikezawa
- Color Design/Color Coordination Inspection: Akemi Nagao
- Coloring Cooperator: Studio GIMLET, T2 studio, Studio OZ, Taikan
- Animation Studio Coloring Manager: Kosuke Kobashi
- Texture Painter: Yukiko Kakita(T2 Studio), Emi Nonaka
- Digital Animator: Masato Takeuchi
- Administer of Backgroud: Yukihiro Watanabe
- Computer graphics: Shogo Tsurii, Kayoko Zama, Hiroyasu Kobayashi
- CGI Manager: Yuki Hanzawa
- Cinematographer: Eiji Tsuchida
- Filming: Tomoyuki Sakurada, Emi Nonaka, Sou Shi Ken
- Editor: Hidemi Li
- Music: "Yume no HERO"
- Composer: Kisaburo Suzuki, "Motto kimi wo shireba"
- Composer: Kisaburo Suzuki
- Music Cooperation: FlyingDog, Inc.
- Cast: Koichi Yamadera
- Sound Effect Director: Haru Yamada（sound team - donjuan）
- Line Manager: Shoichiro Taguchi
- Line Assistant: Kazuya Masumoto
- Animation Production: TRIGGER
- Director: Akira Amemiya
- "Yume no HERO"
- "Motto kimi wo shireba"