The Fandom Post is reporting that Tubi TV is now streaming the Dai-Guard anime on its service. The 26 episodes of the anime originally aired on Japanese television in 1999 over two cours.
The story of Dai-Guard is described as:
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: The Fandom Post