The Greek mythology of Cancer the Crab is simply a family mess. It is hard to imagine that the mighty family of Zeus could be so dysfunctional, but there you have it. The story begins with Zeus having an affair with Alcmene, the queen of Tiryns. The result of this union was the Heracles (the Romans named him our familiar Hercules), the most famous Greek Hero. Of course, this union and offspring did not go over too well with Hera, the wife of Zeus. Hera, in her jealous state, swore to kill Hercules. Hera attempted to have Hercules killed many times but his imposing strength allowed him to overcome. Cancer comes into this ‘beloved’ scene when Hercules is fighting the terrible water-serpent, Hydra. During the battle between Heracles and Hydra,