Catastrophe, Series 4

We re-join the couple after Rob's secret relapse to alcoholism ended in a dramatic car crash and forced confession to Sharon, while Chris (Mark Bonnar) displayed an unexpected softer side towards Rob and an altogether less soft side to Fran's obnoxious new boyfriend.  Now, as Rob tries to head on the straight and narrow and Sharon does her best to support, "it's like he's on a crusade, but to somewhere boring and we all have to come", will the couple navigate the relentless tsunami of life's challenges, or see their relationship finally submerged by it all?   With Rob potentially not the only one on the wrong side of the law, health issues, new religious dalliances, a "briefcase of vegetables" and ever-infuriating family members to contend with, what could possibly go wrong?