Robocaterpilas is a bootleg of the Robogoron Caterpilas, by an unknown company. While it was sold outside Italy, GIG distributed it in Italy.
Its product number is TP–851.
The story on the top of the box looks like an attempt to rewrite the one that's included on the official toy's box, but in English. Here's the story from Robocaterpilas' box, spelling errors and all:
In the year of 2295, the human race faced a biggest crisis. This earth was beginning to be ruled by machines and computors (bio-metals) been parasitic on by a new type of organic virus (provides proliferating function by changing metal to organic matter) which had been transported by a metercrite. The human race had to escape underground. They manufactured a new creature applying the organic virus collected from the biometals. This new born creature had a thick and strong shell, so he could resist any attack from outside as a sphere attitude. His staple good was the metals other than his comrade. He was equipped with the proliferating function like the viometals. This creature was named "Robocaterpilas" and was studied and developed scores of sorts with different functions. Robocaterpilas was released to the ground and began to eat the biometals continuing the proliferation for the purpose of recoverring the world in the hand of human race again. Now began here the battle between Robocaterpilas and the bio-metals in the year 2300.
Here's another description on a side of the box:
He has very aggresive character He will charge at the enemy and knock down at once with his big body whenever he has found an enemy. He destroys by treading on anyone smaller than him. Because he is a trial No. 1 proliferated underground and the inside of his living body is weak against the ultraviolet rays. so he moves as a sphere in broad day light, but changes shape after sunset and enters upon an aggresive attitude. He is also capable of walking under the ground.
It can move around, while rolled into a ball or unfurled. The left and right sides of its core have translucent, red plastic, through which you can see a light.