Since 2003, Special Agent Leroy Gibbs (Mark Harmon) and his revolving team of associates have had to solve numerous crimes on NCIS, and over the course of its run, plenty of fresh blood has gotten thrown into the mix. For the season 17 episode, "Someone Else's Shoes," Joseph Lee Anderson officially entered this dark, murky universe as Marine Lance Corporal Bernard Ernest Williams (or "Barney" for short). 

While investigating a murder, Gibbs and the team stumble upon a homeless encampment where Barney is residing. At first, no one really seems to be of much help, but Barney agrees to show them where the deceased used to sleep. Barney is, at first, a suspect — but it's not long until he's attacked as well, at which point Gibbs' unit takes a special interest in keeping guard throughout the homeless camp, just in case the attacker strikes again. 

The episode raises the important issue of how the United States treats its veterans after they return home from war, and how many of them lack the resources to get back on their feet. It is emotional viewing, and Anderson is the kind of actor who really pulls you into whatever part he's playing.