Investigating the brutal murder of a homeless man bludgeoned to death with a brick, Joel and Fearless follow up on a tip from Teresa and discover two filmmakers who pay vagrants to become would-be gladiators and battle each other in the park; when the detectives realize that the filmmakers bribed a homeless drunk to land the fatal blows, they team up with Tom and David in the search for evidence to convict them.
Donnie Wahlberg
Detective Joel Stevens
Neal McDonough
Assistant District Attorney David McNorris
Mykelti Williamson
Police Department Detective II Bobby 'Fearless' Smith
Gary Basaraba
Police Department Police Officer III Ray Hechler
Lana Parrilla
Teresa Ortiz, paramedic in season one, rookie police officer in season two
Jason Gedrick
Police Department Police Officer II Tom Turcotte