Russell's in the Costa Rican jungle with YouTube singing superstar Conor Maynard for the most foolhardy mission yet, with just their mobile phone to help them survive.

The Maleku tribe set the mission, which would be easy if it wasn't for deadly bullet ants, giant abseils and fast river crossings. Oh, and the fact that, for this task, internet reception rarely gets above one bar. Battling humidity and monsoon, the lads will have to convert their phones into multi-tools - using their backlights to attract grasshoppers for dinner - and rely on the inbuilt compass to navigate them safely back to civilisation.

Joining Russell Kane is the rock ‘n' roll, heartthrob internet star, Mazzi Maz. The useless pair are chased across Poland by scary-looking guards with dogs. Our hapless heroes are convinced that, even though they have no evasion or tracking skills or any ability to speak a word in Polish, they can evade capture by using just their mobile phones. They are sorely mistaken!

They'll use the phone in any way they know how: video-calling experts, referring to YouTube survivalists and how-to sites, and calling upon their Twitter followers - anything.

By relying on satnav over a traditional map, the duo find themselves in a derelict, deserted town. There, they video call a teenage doomsday-prepper who helps them convert rubbish into treasure by giving them warmth. But can their phone help them hotwire a motorbike or drive a military tank?

They'll quickly need to learn how to camouflage themselves to avoid getting chewed up by the guard's dogs. But perhaps their biggest challenge comes in the shape of having to make a choice between starving to death or skinning a rabbit the size of a domestic cat.