Explosion! Knot Buster!!
Dai-Guard finds itself in trouble when a balloon type Heterodyne shows up. Not only does the giant robot find it hard to manoeuvre on the grassy terrain, but the Heterodyne keeps slipping out of its hands! Can Dai-Guard defeat the creature before it destroys a nearby dam and floods the surrounding area? But more importantly, has Tanigawa really gone on a date with Ijuuyin?
Aired 30/11/1999EP 9 - Explosion! Knot Buster!!

Dai-Guard
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: Anime News Network)