This episode follows the Fight or Flight show and is all about escaping or confronting danger. Matt dissects a peer-reviewed paper modelling a zombie outbreak, Helen explores some battles in maths and science, Steve looks at how periodic Cicadas may evade predation and Greg Foot puts an unlucky audience member under some intense exercise. There's also an exclusive new song from Helen entitled 'The Nature of Things'.   Written and devised by Helen Arney, Steve Mould and Matt Parker. Produced by Ed Prosser.