Mark is a fictional character portrayed by John Ruby in the TV series Castle.
They appear in 1 episodes out of a total of 173 aired
Episodes1
47 Seconds
episode S4.E19 march 2012The FBI commandeers the NYPD detectives for little more than leg work after a bomb explodes during an anti-globalist demonstration. Castle is asked by Captain Gates to help out by using his speed-reading ability and attention to detail to sifting through mountains of witness depositions. This helps the 12th precinct team get on the right track after the FBI concentrates on the wrong suspect.