Charlie Cox returns as lawyer-slash-vigilante Matt Murdock, with Vincent D’Onofrio as Kingpin/Wilson Fisk. The series also stars Jon Bernthal, Deborah Ann Woll, and Elden Henson.
It would be a huge mistake to replace any of them. As well as the blonde lady from the second season? Or was that first season. At the end they pulled a bit of a twist that made me go OH CRAP that's awesome.
And I was SHOCKED at how dark it was but I did love it.