Touched by the Gods: Part One (S01E12)

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. The heroes set out under the cover of night, but soon Jason's intentions start to unravel. As the alarm is raised, it will take more than just courage and chemistry to save his life – he needs the help of someone on the inside. (BBC)