The base is an old black game boy cartridge (it was "Pokemon card game", nothing XD) to which I removed the labeled part, putting the motherboard in plain sight.
I had already added a skull before but did not make it, so I added another advanced from a purchase of pendants on ebay.
The arms were obtained from a "Terminator salvation" toy while the limbs above were of a marvel character sold in pieces with the superheroes.
The eye (my great pride) is simply a pearl decorated and pealed several times in a substance used to make the mirrors of water in the dioramas.