Victoria Coren Mitchell hosts as first-round losers the Whitcombes and the Severns get another chance to stay in the competition and reach the second stage. The contestants must use patience, lateral thinking and sheer inspiration to make connections between four things that may appear at first not to be linked, with one set of clues comprising Picacho Peak, La Brea Tar Pits, Sierra Nevada Mountains, and Rio Grande River. (thetvdb.com)