Impulsive and eccentric, Cook loves to have a good time and is constantly the life and soul of any party.[7] Cook shows a great interest in the ladies, and all his partying routinely gets out of hand, leading him into trouble. Previously good フレンズ with Freddie and JJ, his sexual relationship with Effy has gotten between them. Although Effy chooses to be with Freddie, and he has renewed his friendship with JJ and Freddie, his feelings for Effy remain strong. After seeing Freddie and Effy together at a party, Cook takes out his frustration on a guy standing near him, leaving the guy in hospital. Cook is charged with GBH (Grevious Bodily Harm) and is brought to court where he initially pleads 'not guilty'. He then sees the error of his ways and pleads 'guilty'. He is sent to prison but escapes. He then evades the police, hiding in various friends' houses. At the climax of series 4, Cook discovers his friend Freddie's blood-soaked belongings, and confronts Doctor Foster. He describes himself as what he is, a reckless, seemingly useless individual, and in what appears to be a final act, shouts his name and lunges at Foster, ending the series.