alfred william "alfie" moon, played by shane richie, makes his first appearance on 21 november 2002, and leaves on 25 december 2005. he returns to "eastenders" on 21 september 2010, following the return of on-screen wife kat (jessie wallace) two episodes previously. some of the character's most prominent storylines have included: his turbulent relationship with – and later marriage to – kat slater; the dementia and death of his grandmother, nana moon (hilda braid); believing that kat's son tommy had died of cot death, whereas in fact ronnie branning (samantha womack) had switched him with her own deceased child; and his wife's affair with derek branning (jamie foreman).