Bear Grylls takes three more celebrities out of their comfort zones, beginning with Hollywood star Julia Roberts.

Her motto ‘keep laughing’ is put to the test as she embarks on a mission to get life-saving vaccines from Wamba Hospital in Northern Kenya to a remote village that’s two days away across scorching bush and croc-infested rivers.

Julia’s first challenge is getting over a flimsy rope bridge, before dining on a goat’s head.

‘I’ve so much conflict about how I feel about you,’ she says to Bear as he hands her some chargrilled brain…

It’s fuel before their final push, though – they need to get to the village by morning or the vaccines will spoil.