<P> James Bowen is a homeless man and former heroin addict, living on the streets of London, and down to his last bits of change . After a life threatening, drug - related, incident, his support worker, Val, in an attempt to get him off the street, gets him into a council flat, and prescribes him on methadone . On his first night in his flat, he discovers a cat rifling through his food . Assuming he had escaped from somewhere, James tries to return the cat to his real owners . After letting him go, the same evening, the cat returns to James's flat, this time, with a purulent wound on his back leg . Worried, James consults his animal - loving, but allergic, neighbour, Betty . She informs James of a local charity vet that she volunteers at, and names the cat Bob . Waiting for a queue at the vet, James misses a meeting with Val . After the appointment, James later gets Bob castrated and sets him free . However, Bob keeps following James into town, eventually drawing more crowds of people, making James more wealthy, and he eventually decides to keep Bob . Bob becomes a tourist hotspot, and James and Betty start to become romantically attached . </P> <P> One night, while returning home, James finds his old friend, Baz, unconscious on his flat estate, overdosed on heroin . Baz later dies in hospital, and James finds out that Betty cannot be around drug addicts, as her deceased brother had been one . On New Year's Eve, James makes an impromptu visit to his biological father, Jack, his stepmother, Hilary, and his lost sisters, Pris and Faith . After Bob destroys their living room, Hilary sends James and Bob out . </P> <P> One day, while busking, James gets into an argument with a yob, causing the crowd to get in a brawl with the man and James getting arrested for it . After being found innocent, he is prohibited from busking for 6 months . While in the chemist, receiving his methadone, Betty notices him . Betty and James argue and go their separate ways . Later on, James visits the offices of The Big Issue to make some more money for him and Bob . He regains his popularity with tourists by selling The Big Issue . After being accused of illegally selling magazines on another vendor's patch, James and Bob are banned for a whole month . After going back in business, James gets into an argument with a woman trying to buy Bob off him, losing Bob in the scuffle . Bob does not return for a few days, leaving James devastated . After Bob returns, James feels he is ready to come off the methadone . After 48 hours of withdrawal symptoms, James awakes, clean and healthy . A journalist, Mary, requests to write a book about James and Bob after his Internet and media popularity, and James agrees . James then fixes up his relationship with his father Jack, and his life turns around for the better . </P> <Ul> <Li> Luke Treadaway as James Bowen </Li> <Li> Bob as himself . <Ul> <Li> Stand - ins for Bob: Oscar, Booker, Jafffa, Leo, Ricki and Trayce </Li> </Ul> </Li> <Li> Ruta Gedmintas as Betty, Bowen's animal - loving neighbour and James's love interest . </Li> <Li> Joanne Froggatt as Val, Bowen's drug support worker . </Li> <Li> Anthony Head as Jack Bowen, Bowen's remarried father . </Li> <Li> Beth Goddard as Hilary, Bowen's father's wife and James's stepmother . </Li> <Li> Caroline Goodall as Mary, an American journalist who persuades him to write a book about Bob . </Li> <Li> Darren Evans as Baz, James's old friend who did not recover from heroin addiction . </Li> <Li> Ruth Sheen as Elsie, a kind middle - aged woman, who gives presents to Bob . </Li> <Li> Nina Wadia as Bus Conductress </Li> </Ul>

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