Catastrophe - Season #4 (Last Season) A single camera comedy, following an Irish woman and a American man as they struggle to fall in love, in London. 1 A new acquaintance becomes increasingly friendly with Rob, while Sharon dabbles in a new hobby. 2 Rob's newly religious sister Sidney visits from the US, and a child's accident at school reveals a surprising teacher-pupil rapport to Sharon. 3 Sharon and Rob decide to get on a fitness drive. When Sharon visits her less-than- sympathetic local GP it dawns on her she's not in the peak condition she imagined. 4 Rob is pretty unenthusiastic about the prospect of celebrating brother-in-law Fergal's 40th birthday. Sharon comes face to face with her mum's new man, while Fran and Chris drunkenly party with their new partners. 5 Sharon is unsettled by a strange moisture patch at school, while Rob's big boss visits London and takes a close interest in his career. Fran and Chris make a major decision. 6 In the final episode, Sharon and Rob arrive in Boston for a family holiday only to receive some tragic news about Rob's mum, Mia