Prometheus Bound centers on a battle for power between Prometheus, the hero, and Zeus, the king of the gods. Doesn't seem quite fair, does it?: Prometheus spends most of his time chained to a rock, while Zeus is the master of the universe, with the ability to hurl fire and lightning, cast Prometheus into the depths of the earth, and command the other gods. But "other gods" is the key here: even if Hephaestus and Oceanus and Power and Violence hop to it to do Zeus's bidding, Prometheus refuses. No matter what, Prometheus stays true to himself—and keeps his secret knowledge hidden. Is that real power? Or is Prometheus just as naïve as a college freshman on a hunger strike?
Ultimately, Prometheus's knowledge of the future makes him more powerful than Zeus.
Zeus ends up seeming more powerful than Prometheus because he remains offstage.