The entity known as "The Shadow from Beyond Time" is a Cthulhu like being which exists outside of time and space. It intersects with out universe at multiple points in time and space simultaneously, and, if left unchecked, will expand and eventually consumes the whole universe across the entire space-time continuum until nothing but it ever existed. After Robo stopped it in 1926, it has held something of a grudge against him, and in a convoluted paradox of causality the pair of them are stalking each other