Michael Medeiros has portrayed six different characters over the course of the series:
- Episode 4.20 Nurture (1994) - Detective Harding
- Episode 7.5 Corruption (1996) - Internal Affairs Detective Reynolds
- Episode 8.19 Disappeared (1998) - Matthew O'Dell
- Episode 12.3 For Love or Money (2001) - Vince Renalfi
- Episode 14.8 Embedded (2003) - Defense Attorney Stewart Griffin
- Episode 18.16 Strike (2008) - Mike Dolci
Andrew Polk has played five different roles over the course of the series:
- Episode 20.18 Brazil (2010) - Eli Driscoll
- Episode 18.16 Strike (2008) - Bank Manager
- Episode 13.12 Under God (2003) - Jared Sterling
- Episode 11.3 Dissonance (2000) - Stuart
- Episode 7.19 Double Down (1997) - CSU Technician
Shawn Andrew has played three different characters over the course of the series:
- Episode 20.10 Shotgun (2009) - Sensei Joseph
- Episode 18.16 Strike (2008) - Courthouse Guard
- Episode 16.22 Invaders (2006) - Ricky Robinson
Elizabeth Rich (Woman in Gallery) also played the role of Paramedic Larson in episode 20.18, Brazil (2010).