| Episode cast overview, first billed only: | |||
| Michael C. Hall | ... | Dexter Morgan | |
| Julie Benz | ... | Rita Morgan | |
| Jennifer Carpenter | ... | Debra Morgan | |
| Desmond Harrington | ... | Det. Joseph 'Joey' Quinn | |
| C.S. Lee | ... | Vince Masuka | |
| Luna Lauren Velez | ... | Lt. Maria LaGuerta (as Lauren Velez) | |
| David Zayas | ... | Sgt. Angel Batista | |
| James Remar | ... | Harry Morgan | |
| John Lithgow | ... | Arthur Mitchell | |
| David Ramsey | ... | Anton Briggs | |
| Courtney Ford | ... | Christine Hill | |
| Suzanne Cryer | ... | Tarla Grant | |
| J.C. MacKenzie | ... | Andy Brightman | |
| Keith Carradine | ... | Frank Lundy | |
| Christina Robinson | ... | Astor Bennett | |
When a local vandal begins stirring up trouble, Dexter's neighborhood becomes vigilant and wary, two things Dexter doesn't need. His mobility is also hampered by Rita, who insists on driving him around after his accident. Debra is upset when Anton announces he's taken a local job to spend more time with her. Meanwhile, the Trinity Killer dispatches his next victim. Debra becomes drawn to Lundy's theories about Trinity, while Dexter finds himself in awe of Trinity's masterful killing technique. Despite their enthusiasm, LaGuerta threatens to shut down the investigation, instead focused on bringing the Vacation Murderers to justice.