| Season Episode: 4x01 |
| Episode: 66 |
| Production Number: 401 |
| Original Air Date: 2008-09-24 |
| Title: Mayhem |
| |
| Season Episode: 4x02 |
| Episode: 67 |
| Production Number: 402 |
| Original Air Date: 2008-10-01 |
| Title: The Angel Maker |
| |
| Season Episode: 4x03 |
| Episode: 68 |
| Production Number: 403 |
| Original Air Date: 2008-10-08 |
| Title: Minimal Loss |
| |
| Season Episode: 4x04 |
| Episode: 69 |
| Production Number: 404 |
| Original Air Date: 2008-10-22 |
| Title: Paradise |
| |
| Season Episode: 4x05 |
| Episode: 70 |
| Production Number: 405 |
| Original Air Date: 2008-10-29 |
| Title: Catching Out |
| |
| Season Episode: 4x06 |
| Episode: 71 |
| Production Number: 406 |
| Original Air Date: 2008-11-05 |
| Title: The Instincts |
| |
| Season Episode: 4x07 |
| Episode: 72 |
| Production Number: 407 |
| Original Air Date: 2008-11-12 |
| Title: Memoriam |
| |
| Season Episode: 4x08 |
| Episode: 73 |
| Production Number: 408 |
| Original Air Date: 2008-11-19 |
| Title: Masterpiece |
| |
| Season Episode: 4x09 |
| Episode: 74 |
| Production Number: 409 |
| Original Air Date: 2008-11-26 |
| Title: 52 Pickup |
| |
| Season Episode: 4x10 |
| Episode: 75 |
| Production Number: 410 |
| Original Air Date: 2008-12-10 |
| Title: Brothers in Arms |
|  |
| Season Episode: 4x11 |
| Episode: 76 |
| Production Number: 411 |
| Original Air Date: 2008-12-17 |
| Title: Normal |
| |
| Season Episode: 4x12 |
| Episode: 77 |
| Production Number: 412 |
| Original Air Date: 2009-01-14 |
| Title: Soul Mates |
| |
| Season Episode: 4x13 |
| Episode: 78 |
| Production Number: 413 |
| Original Air Date: 2009-01-21 |
| Title: Bloodline |
| |
| Season Episode: 4x14 |
| Episode: 79 |
| Production Number: 414 |
| Original Air Date: 2009-02-11 |
| Title: Cold Comfort |
| |
| Season Episode: 4x15 |
| Episode: 80 |
| Production Number: 415 |
| Original Air Date: 2009-02-18 |
| Title: Zoe's Reprise |
| |
| Season Episode: 4x16 |
| Episode: 81 |
| Production Number: 416 |
| Original Air Date: 2009-02-25 |
| Title: Pleasure Is My Business |
| |
| Season Episode: 4x17 |
| Episode: 82 |
| Production Number: 417 |
| Original Air Date: 2009-03-11 |
| Title: Demonology |
| |
| Season Episode: 4x18 |
| Episode: 83 |
| Production Number: 418 |
| Original Air Date: 2009-03-18 |
| Title: Omnivore |
| |
| Season Episode: 4x19 |
| Episode: 84 |
| Production Number: 419 |
| Original Air Date: 2009-03-25 |
| Title: House on Fire |
| |
| Season Episode: 4x20 |
| Episode: 85 |
| Production Number: 420 |
| Original Air Date: 2009-04-08 |
| Title: Conflicted |
| |
| Season Episode: 4x21 |
| Episode: 86 |
| Production Number: 421 |
| Original Air Date: 2009-04-22 |
| Title: A Shade of Gray |
| |
| Season Episode: 4x22 |
| Episode: 87 |
| Production Number: 422 |
| Original Air Date: 2009-04-29 |
| Title: The Big Wheel |
| |
| Season Episode: 4x23 |
| Episode: 88 |
| Production Number: 423 |
| Original Air Date: 2009-05-06 |
| Title: Roadkill |
| |
| Season Episode: 4x24 |
| Episode: 89 |
| Production Number: 424 |
| Original Air Date: 2009-05-13 |
| Title: Amplification |
| |
| Season Episode: 4x25 |
| Episode: 90 |
| Production Number: 425 |
| Original Air Date: 2009-05-20 |
| Title: To Hell...And Back (1) |
| |
| Season Episode: 4x26 |
| Episode: 91 |
| Production Number: 426 |
| Original Air Date: 2009-05-20 |
| Title: To Hell...And Back (2) |
| |
