Dave has 72 hours to get from the Sahara to the altar, where Ellen awaits.
Pete makes a dash from the Kyrgyzstan wilderness to reach his woodland wedding to Alex.
Laura tries to get back from Bulgaria to marry Dave.
While Nicola finishes the wedding preparations at home, Ash is stranded in Mexico.
Lara is left alongside her girlfriends on a remote island in Nicaragua's cloud forest.
Kieran and his three friends are stranded in the Zapotitlan desert in Mexico.