The all-too mortal Jason of the Argonauts and his new friends, Hercules and Pythagoras, reunite to romp again in the BBC's hit family fantasy series, set in the mythical streets and palaces of ancient Atlantis. Will Jason finally decode his own destiny, foretold by a cryptic oracle? Mythology roars to life in this playful mix of legend, adventure, comedy and sci-fi, starring Jack Donnelly (Dancing on the Edge) as Jason, Mark Addy (Game of Thrones) as portly Hercules, and Robert Emms (War Horse) as studious Pythagoras. More great fun from the creators of Merlin.