|Spouse(s)||Unnamed wife (deceased)|
|Portrayed by||Adrian Pasdar|
Mark Fallon is a ten-year Federal Agent with the Department of Homeland Security.
Fallon was on the phone with his wife when her flight crashed into the World Trade Center towers during the September 11, 2001 terrorist attacks. He joined the Department of Homeland Security in order to make sure that something like this would never happen on American soil ever again.
In 2011 he aids the authorities in foiling a suspected terrorist plot having to work with Kate Beckett and her team, which is eventually successful despite his rough tatics which causes conflicts between him and Kate Beckett's team. (Setup) (Countdown)