The Scientific Defense Guard is a branch of the Earth Defence Force.
- Members :
* Captain Tetsuo Akiyama
* Cpatain Daisuke Gondo
* Kei Marume
* Hiroaki Tobe
* Mutsumi Hoshikawa
* Choichiro Hikari - Affiliations : Earth Defense Military, U40
- Designations : To protect humanity from any alien threats and giant monsters
- First appearance : The Ultraman Episode 1
- Latest appearance : The Ultraman Episode 50