Gelderah bears resemblance to a beaked dragon, and also has features of an insect such as the large antennae protruding from his forehead. He also has pointed, elf-like ears for hearing and his brain is visible in between them which glows red and orange.
A Terror-Missile crashed into a lake. Once Zone Fighter stopped the activity of the Garoga agents near the lake the missile exploded and released the Red Headed Terror-Beast: Gelderah! After an epic battle between the two giant's however Zone Fighter finished him off by cutting his head off with a level 2 Arrow Beam.
Geldarah can breath a corrosive mist from his mouth that can cause explosions or burn anything that it can touch. He is also able to use his teeth to grip an opponent (albeit painfully).
The creature didn't have much of a mission as Zone Fighter killed Gelderah before it could finish what it was doing.