Greek mythology to dominance is frequently called the "Dorian invasion". The Lydian and later the Macedonian kings, as rulers of the same rank, also became Heracleidae. Other members of this earliest generation of heroes such as Perseus, Deucalion, Theseus and Bellerophon, have many traits in common with Heracles. Like him, their exploits are solitary, fantastic and border on fairy tale, as they slay monsters such as the Chimera and Medusa. Bellerophon's adventures are commonplace types, similar to the adventures of Heracles and Theseus. Sending a hero to his presumed death is also a recurrent theme of this early heroic tradition, used in
Unleashed (Fringe) for Walter, and actor Joshua Jackson characterized the scene as Walter's "action hero moment". The actor himself, John Noble, described the scene with the chimera as "terrifying", as his character "tries to be a hero". Andrew Orloff, Zoic’s Creative Director and Visual Effects Supervisor later called the chimera effect the most difficult effect he'd done for the show thus far. Sound editor Thomas Harris explained that because the episode had a monster that was "part lizard, part wasp, part bat, and part lion," it was difficult to "manipulate sounds from all these animals, as well as other sweeteners, without getting