Series 2 of The Last Kingdom began broadcast on BBC Two last Thursday, 16th March. Joseph's character AElfric makes his series 2 reappearance in episode 2, airing 23rd March 217. 

...an episode that throbs with life and offers more in the way of cut and thrust, romance and gore. Plus, we welcome the return of wicked Uncle Eolfric, who is this week’s Bit Part Baddie. He usurped Uhtred from his rightful lands in Northumbria, something neither of them have forgotten... Radio Times

Each episode of series 2 is available to buy / download from iTunes and BBC Store after broadcast.