Fey centaurs. A Jason recently transplanted from Venice Beach, California. Cheesy dialogue. Dennis Hopper. These and other absurdities are mildly distracting during NBC’s three-hour shields-and-spears epic, but it takes Herculean forces to blunt the impact (and entertainment value) of Greek myth. The story starts in the kingdom of Ioleus in 2000 BC, just as the good king Aeson (Ciaran Hinds) is assassinated by his treacherous brother Pelias (Dennis Hopper). Jason, pre-teen heir to the throne and also next in line for his uncle’s knife, is spirited away to safety by a courageous palace guard (Mark Lewis Jones). A decade later, the exiled prince (Jason London), who h...