Complete Monster: The Titan Cronus after he escapes from Tartarus (where he was imprisoned for being an evil tyrant and for trying to kill his kids). He waste no time in seeking to resume his dominance over the world and all in it. With nothing but hatred for his children and the other Gods, Cronus is utterly brutal and merciless in his tactics, which include torturing and trying to kill his own children while throwing the world into chaos and disarray. Cronus eventually gets tired of the human heroes resisting him and makes it a point to attempt to exterminate the entire human race in retribution. At other points, Cronus releases the savage werewolf Lycaon from imprisonment to eat "whomever he may please" and tries to get his mother Gaea to kill Zeus for him. Sophisticated, suave, seemingly polite and never at loss for a vicious plan, Cronus repeatedly proves how nothing will stand in the way of his goals of domination and destruction.
Most Annoying Sound: During their expedition to Atlantis, Neil frequently says "Ping!" for no other discernible reason than that it annoys Archie half to death.
The Oracle. In "Chaos 101", Cronus tries to say that the Oracle works for him, but the Oracle tersely reminds him that "I work for everyone." Throughout the series, he proves this, providing information not only for Cronus but also for the seven heroes, of whom he seems to be rather fond.
Also Thanatos, the god of death, whose purpose is very simple: to collect the deceased. He is neither good nor evil, and will obey only whoever wears the Helmet of Darkness.
Uncanny Valley: In "Cronus 2.0", Odie devises a computer program that simulates Cronus. Hephaestus builds a robot to utilize the program for training, but the resemblance to the actual Cronus terrifies Theresa. With good reason, as it turns out.