| Season Episode: 4x01 |
| Episode: 57 |
| Production Number: 401 |
| Original Air Date: 2008-03-05 |
| Title: Fort Mifflin |
| |
| Season Episode: 4x02 |
| Episode: 58 |
| Production Number: 402 |
| Original Air Date: 2008-03-12 |
| Title: Two to Tango |
| |
| Season Episode: 4x03 |
| Episode: 59 |
| Production Number: 403 |
| Original Air Date: 2008-03-19 |
| Title: Words From Beyond |
| |
| Season Episode: 4x04 |
| Episode: 60 |
| Production Number: 404 |
| Original Air Date: 2008-03-26 |
| Title: Fear Cage |
| |
| Season Episode: 4x05 |
| Episode: 61 |
| Production Number: 405 |
| Original Air Date: 2008-04-02 |
| Title: Ghostly Bounty Hunter |
| |
| |
| Season Episode: 4x07 |
| Episode: 63 |
| Production Number: 407 |
| Original Air Date: 2008-04-16 |
| Title: Ghostly Conversation |
| |
| Season Episode: 4x08 |
| Episode: 64 |
| Production Number: 408 |
| Original Air Date: 2008-04-23 |
| Title: Spirits of the Old West |
| |
| Season Episode: 4x09 |
| Episode: 65 |
| Production Number: 409 |
| Original Air Date: 2008-04-30 |
| Title: Haunted Asylum |
| |
| Season Episode: 4x10 |
| Episode: 66 |
| Production Number: 410 |
| Original Air Date: 2008-05-28 |
| Title: House of Spirits |
| |
| Season Episode: 4x11 |
| Episode: 67 |
| Production Number: 411 |
| Original Air Date: 2008-06-04 |
| Title: Widow's Watch |
| |
| Season Episode: 4x12 |
| Episode: 68 |
| Production Number: 412 |
| Original Air Date: 2008-06-11 |
| Title: Garden State Ghosts |
| |
| Season Episode: 4x13 |
| Episode: 69 |
| Production Number: 413 |
| Original Air Date: 2008-06-18 |
| Title: Fort Delaware |
| |
| Season Episode: 4x14 |
| Episode: 70 |
| Production Number: 414 |
| Original Air Date: 2008-09-03 |
| Title: Iron Island |
| |
| |
| Season Episode: 4x16 |
| Episode: 72 |
| Production Number: 416 |
| Original Air Date: 2008-09-17 |
| Title: The Boy in the Brothel |
| |
| Season Episode: 4x17 |
| Episode: 73 |
| Production Number: 417 |
| Original Air Date: 2008-09-24 |
| Title: Speaking with the Dead |
| |
| |
| Season Episode: 4x19 |
| Episode: 75 |
| Production Number: 419 |
| Original Air Date: 2008-10-08 |
| Title: Oak Alley Plantation |
|  |
| Season Episode: 4x20 |
| Episode: 76 |
| Production Number: 420 |
| Original Air Date: 2008-10-15 |
| Title: Bottled Spirits |
| |
| Season Episode: 4x21 |
| Episode: 77 |
| Production Number: 421 |
| Original Air Date: 2008-10-22 |
| Title: Home Town Haunts |
| |
| Season Episode: 4x22 |
| Episode: 78 |
| Production Number: 422 |
| Original Air Date: 2008-10-29 |
| Title: USS Hornet |
| |
| Season Episode: 4x23 |
| Episode: 80 |
| Production Number: 424 |
| Original Air Date: 2008-11-05 |
| Title: Live Show Results |
| |
| |
| Season Episode: 4x25 |
| Episode: 82 |
| Production Number: 426 |
| Original Air Date: 2008-11-19 |
| Title: Recycled Souls |
| |
| Season Episode: 4x26 |
| Episode: 83 |
| Production Number: 427 |
| Original Air Date: 2008-12-03 |
| Title: Spirits on the Water |
| |
| |
