He (why Mekano is referred to as he, is probably because of its man like appearance) was created by a scientist called Bill Foster, to be a revolutionary step in the field of science.
Because of his assistant, young boy called Tommy, Mekano went to a rampage. He was stopped by him before any lifes were lost.
Mekano was then stolen by a bunch of nazis, to be used as a nearly unstoppable weapon. But, their plans were thwarted by Mekano, Bill, Tommy and Sandra (a girl who almost got killed by the same nazis).
Mekano had developed feelings during the course of his existence. He had fallen in love with Sandra (or was, at least, starting to).
Mekano (or rest of the gang) never appeared after this story, at least, not in any published comic.