The Ka-Magnon, inhabitants of the planet Ka-Magnon, attempted to invade Earth with a gigantic robotic spider with a single huge eye, the "Eye of Ka", which they brought down in the Orkneys. The Steel Claw infiltrated the machine and discovered that it was actually a spacecraft piloted by six of the aliens. He destroyed the ship and its crew, and the aliens' orbiting mothership fled back to Ka-Magnon, having decided that Earth was not suitable for conquest.