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"Sean Maher has signed up to appear in an upcoming episode of Arrow. The Firefly actor will play the villain Mark Scheffer in the tenth episode of the current second season, states The Hollywood Reporter.   Scheffer is better known as the supervillain Shrapnel in the original DC Comics, a bomber who terrorises Starling City and threatens Sebastian Blood (Kevin Alejandro). Shrapnel is also made of metal and has superhuman strength, while he was previously married with two daughters. Maher&amp;#039;s former Firefly and Serenity co-star Summer Glau was previously cast in a recurring role in the series. The actor starred in Joss Whedon&amp;#039;s adaptation of Much Ado About Nothing earlier this year. Arrow airs on Wednesdays at 8pm on The CW in the US and Mondays at 8pm on Sky1 in the UK. Watch Arrow star Colton Haynes discuss Roy Harper and the new season with Digital Spy below:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/arrow/news/a525949/firefly-star-sean-maher-joins-arrow-as-villain/>