Spideros is bipedal with three pairs of arms, and the majority of its body is covered in black and yellow-striped fur. It has an orange, insectoid head with a single row of three long spikes and a pair of yellow eyes; a dark grey, smooth torso with red abs on its front and a single orange spike on its back; a pair of main arms with four orange claws on each hand and two pairs of thinner arms that have pincers of the same color; a pair of thick legs with a single curved claw on each foot; and a round abdomen with one row of three orange spikes and two rows of three yellow spots going down its topside.
After the Garoga Spider drinks blood from a gorilla, transforming it into Garoga Gorilla, the Garogas launch a Terror-Beast missile, containing the arachnid kaiju Spideros. Spideros didn't seem like much of a threat at first but it managed to trap Zone Fighter in its web-spray. Zone Angel and Zone Junior arrived in the nick of time and burned the webbing away with their beams and recharged Zone Fighter with the Beam Lamps. Zone Fighter then went on to defeat Spideros reasonably easily.
Spideros briefly appears via flashback as the Garogas contemplate the many defeats they have suffered at the hands of Zone Fighter, exploding as he is hit by an unseen attack. Strangely, this Spideros has only two arms and blue stripes.
Spideros can fire silver thread (銀色糸 gin'iro ito) from its mouth, which was able to immobilize Zone Fighter in a matter of seconds. However, it was completely dissolved by beams fired by Zone Angel and Zone Junior.
According to All Kaiju Kaijin (First Volume), Spideros' horns are venomous, with even one prick being able to take down an opponent. Although Spideros attempted to impale Zone Fighter with its horns, it was unable to land a single stab with them.
Spideros is capable of gliding flight; its means of propulsion unknown. It used its flight in order to attack Zone Fighter, flying around while attacking with its claws and horns.
Spideros can fire a trio of red lasers from its mouth which knocked Hikaru off his feet but otherwise left him unharmed.
After being deployed and bursting from the Terror-Beast Missile, Spideros slowly descended to the ground with the help of three parachutes which detached upon landing.
- Main article: Spideros/Gallery.
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