Will Arnett just finished the sixth and final season playing the lead horse in BoJack Horseman -- an animated Netflix series about a former sitcom … Will Arnett, the voice of Lego Batman in three successful movie comedies, expands his relationship with the Danish toy company by taking the reins as host of Lego Masters (Feb. 5 on Fox). Arnett says the series is all about people who are really good at building with Legos. 'Their creativity and skill are off the charts.'