Mad scientist dangerous or questionable, which can make them accidental villains. The prototypical fictional mad scientist was Victor Frankenstein, creator of his eponymous monster, who made his first appearance in 1818, in the novel "Frankenstein, or the Modern Prometheus" by Mary Shelley. Though the novel's title character, Victor Frankenstein, is a sympathetic character, the critical element of conducting experiments that cross "boundaries that ought not to be crossed", heedless of the consequences, is present in Shelley's novel. Frankenstein was trained as both an alchemist and a modern scientist, which makes him the bridge between two eras of an evolving archetype. The book
Prometheus him. Moreover, Aeschylus anachronistically and artificially injects Io, another victim of Zeus's violence and ancestor of Heracles, into Prometheus' story. Finally, just as Aeschylus gave Prometheus a key role in bringing Zeus to power, he also attributed to him secret knowledge that could lead to Zeus's downfall: Prometheus had been told by his mother Themis, who in the play is identified with Gaia (Earth), of a potential marriage that would produce a son who would overthrow Zeus. Fragmentary evidence indicates that Heracles, as in Hesiod, frees the Titan in the trilogy's second play, "Prometheus Unbound". It is apparently not until