Firefly alum Sean Maher will guest star in Arrow. He will appear in the tenth episode of the season as the serial bomber Mark Scheffer, also known as Shrapnel, "who places Starling City in a grip of terror and threatens the life of Sebastian Blood" revealed THR
Firefly Alum Sean Maher Joins Arrow as DC comics Villain
Considering Summer Glau has a recurring role as Isabel Rochev in Arrow, it would be interesting to see if Sean and Summer, who played Maher's sister River Tam on Whedon's Firefly, have any scenes together.
Summer Glau as River Tam and Sean Maher as Simon Tam
Waiting for the Nathan Fillion cameo...
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