Firefly's Sean Maher has been cast in season two of Arrow as the evil Mark Scheffer, aka Shrapnel in the DC Comics.
THR has it Maher's character will be a serial bomber who places Starling City in a grip of terror and threatens the life of Sebastian Blood (Kevin Alejandro).
In the comics, Mark Scheffer becomes the supervillain Shrapnel, whose powers include being made of organic metal, and encounters the Doom Patrol.
Sean Maher is known for Dr. Simon Tam in the cult-favorite Firefly Joss Whedon series and Serenity movie.
Arrow airs Wednesdays at 8pm ET on the CW.