Chikyuu Bouei Kigyou Dai-Guard
English title: Dai-Guard: Terrestrial Defense Corp.
Japanese title: 地球防衛企業ダイ・ガード
Alternative titles: Dai-Guard, Daiguard
Type: TV
Source: Original
Episodes: 26
Status: Finished Airing
Aired: Oct 5, 1999 to Mar 28, 2000
Broadcast: Tuesdays at 18:00 (JST)
Duration: 23 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Xebec
Producers: TV Tokyo, Sotsu, Victor Entertainment, TV Tokyo Music
Licensors: ADV Films, Discotek Media
Genres: Adventure, Comedy, Sci-Fi
Themes: Mecha, Military

Thirteen years after their sudden disappearance, an alien race known as the Heterodyne resurface without warning. To combat the Heterodyne, three office workers from the 21st Century Security Corporation operate Dai-Guard - a giant robot no longer regarded as an oversized paperweight. Unfortunately, Dai-Guard is somewhat obsolete and in disrepair. It's a tough job, but salarymen can also save the world. 

(Source: ANN)