Clash of the Titans returns with two celebrity teams, led by Freddie Flintoff and Steve Redgrave, competing against one another. Emily Howard from 'Little Britain' makes her return as does Michael Crawford in a new 'Some Mothers Do Have 'Em' sketch. There's also a special minisode of 'Luther' and celebrity guests in the studio including Lacey Turner and Jo Brand. James Bay and Birdy perform.