The first surprise about new BBC1 fantasy adventure drama Atlantis is that it begins in the modern day.

Our young hero Jason (Jack Donnelly) is about to dive in a one man submarine to find the wreckage of his father’s long lost sub.

Later finding himself naked on a beach with only the sand between his toes for company.

The 13-part Saturday night series continues to surprise as we venture into the mythical city of Atlantis and meet some legendary names.

Including brilliant but innocent Greek maths genius Pythagoras (Robert Emms) – “the triangle guy”.

And a different take on strong man Hercules, played by Mark Addy, who explains: “I’m not fat. I’m big boned.”

Atlantis is the BBC’s replacement for Merlin and comes, in part, from the team behind that show.