Jason is reminded of his promise to Circe and her grim warning should he fail to honour their pact. With her threat hanging over him he has no choice but to act. He must kill the Queen.

Infiltrating the palace will not only be mortally dangerous but also nigh on impossible. Under the cover of night, our heroes set out, but soon Jason’s intentions start to unravel. As the alarm is raised, it’s going to take more than just courage and chemistry to save his life – he needs the help of someone on the inside.

The penultimate episode of Atlantis airs on Saturday, 21 December at 7.55 – 8.40pm on BBC One.

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(C) Urban Myth Films/Nick Briggs

Watch the trailer below…