We don't have a biography for Nathaniel Essex / Mister Sinister yet. Hang in there, or go ahead and contribute one.
Appearances
Wolverine and the X-Men
Guest cast, played by Clancy Brown
- Episode 1x12: eXcessive Force (Nov 29, 2008)
- Episode 1x19: Guardian Angel (Feb 28, 2009)
- Episode 1x23: Shades of Grey (Oct 2, 2009)