Tis episode 4, and the arrival of cool Uncle Danny the musician prompts Martin to disown his imagi-nary friend - and while the 12-year-old finds himself quizzed by his family about the birds and the bees, the dejected and rejected Sean seeks solace with other forgotten imaginary friends. Chris O'Dowd, David Rawle star alongside Steve Wall, with the odd guest appearance by Johnny Vegas as Crunchy Danger Haystacks.