Plot: Tim Samuels examines the enduring power of Beowulf, an epic eighth-century Anglo-Saxon poem that has recently been dramatised into a film starring Ray Winstone. Elsewhere, actor and director Steve Buscemi talks to Mark Kermode about making Interview with Sienna Miller; Scottish electro-pop star Calvin Harris takes us behind the scenes of his UK tour; and Radio Times's Grace Dent casts her acid eye over the flood of US TV series starring British actors such as Bionic Woman, which features former EastEnders star Michelle Ryan