| 1x1 | The X-Files | 7.9 |
| 1x2 | Deep Throat | 7.3 |
| 1x03 | Squeeze | 7.2 |
| 1x04 | Conduit | 6.3 |
| 1x05 | The Jersey Devil | 6.6 |
| 1x06 | Shadows | 5.9 |
| 1x07 | Ghost in the Machine | 5.9 |
| 1x08 | Ice | 6.6 |
| 1x09 | Space | 6.5 |
| 1x10 | Fallen Angel | 5.4 |
| 1x11 | Eve | 6.8 |
| 1x12 | Fire | 6.8 |
| 1x13 | Beyond the Sea | 6.6 |
| 1x14 | GenderBender | 7.2 |
| 1x15 | Lazarus | 7.6 |
| 1x16 | Young at Heart | 7.2 |
| 1x17 | E.B.E. | 6.2 |
| 1x18 | Miracle Man | 7.5 |
| 1x19 | Shapes | 7.6 |
| 1x20 | Darkness Falls | 8.0 |
| 1x21 | Tooms | 8.6 |
| 1x22 | Born Again | 8.2 |
| 1x23 | Roland | 7.9 |
| 1x24 | The Erlenmeyer Flask | 8.8 |
| SEASON AVERAGE | 7.1 | |
| 2x1 | Little Green Men | 10.3 |
| 2x2 | The Host | 9.8 |
| 2x03 | Blood | 9.1 |
| 2x04 | Sleepless | 8.6 |
| 2x05 | Duane Barry | 8.9 |
| 2x06 | Ascension | 9.6 |
| 2x07 | 3 | 9.4 |
| 2x08 | One Breath | 9.5 |
| 2x09 | Firewalker | 9.0 |
| 2x10 | Red Museum | 10.4 |
| 2x11 | Excelsis Dei | 8.9 |
| 2x12 | Aubrey | 10.2 |
| 2x13 | Irresistible | 9.2 |
| 2x14 | Die Hand Die Verletzt | 10.7 |
| 2x15 | Fresh Bones | 11.3 |
| 2x16 | Colony | 10.3 |
| 2x17 | End Game | 11.2 |
| 2x18 | Fearful Symmetry | 10.1 |
| 2x19 | Dod Kalm | 10.7 |
| 2x20 | Humbug | 10.3 |
| 2x21 | The Calusari | 8.3 |
| 2x22 | F. Emasculata | 8.9 |
| 2x23 | Soft Light | 8.5 |
| 2x24 | Our Town | 9.4 |
| 2x25 | Anasazi | 10.1 |
| SEASON AVERAGE | 9.7 | |
| 3X01 | The Blessing Way | 12.3 |
| 3X02 | Paper Clip | 11.1 |
| 3X03 | DPO | 10.9 |
| 3X04 | Clyde Bruckman's Final Repose | 10.2 |
| 3X05 | The List | 10.8 |
| 3X06 | 2Shy | 10.2 |
| 3X07 | The Walk | 10.4 |
| 3X08 | Oubliette | 10.2 |
| 3X09 | Nisei | 9.8 |
| 3X10 | 731 | 12.1 |
| 3X11 | Revelations | 10.0 |
| 3X12 | War Of The Coprophages | 10.1 |
| 3X13 | Syzygy | 10.8 |
| 3X14 | Grotesque | 11.6 |
| 3X15 | Piper Maru | 10.6 |
| 3X16 | Apocrypha | 10.8 |
| 3X17 | Pusher | 10.8 |
| 3X18 | Teso Dos Bichos | 10.7 |
| 3X19 | Hell Money | 9.9 |
| 3X20 | Jose Chung's 'From Outer Space' | 10.5 |
| 3X21 | Avatar | 9.3 |
| 3X22 | Quagmire | 10.2 |
| 3X23 | Wetwired | 9.7 |
| 3X24 | Talitha Cumi | 11.2 |
| SEASON AVERAGE | 10.6 | |
| 4X01 | Herrenvolk | 13.2 |
| 4X03 | Home | 11.9 |
| 4X04 | Teliko | 11.3 |
| 4X02 | Unruhe | 11.7 |
| 4X05 | The Field Where I Died | 12.3 |
| 4X06 | Sanguinarium | 11.1 |
| 4X07 | Musings of a CSM | 10.7 |
| 4X09 | Tunguska | 12.2 |
| 4X10 | Terma | 10.6 |
| 4X08 | Paper Hearts | 10.7 |
| 4X11 | El Mundo Gira | 13.3 |
| 4X14 | Leonard Betts | 17.2 |
| 4X13 | Never Again | 13.0 |
| 4X15 | Memento Mori | 11.5 |
| 4X12 | Kaddish | 10.3 |
| 4X16 | Unrequited | 10.9 |
| 4X17 | Tempus Fugit | 11.9 |
| 4X18 | Max | 11.6 |
| 4X19 | Synchrony | 11.3 |
| 4X20 | Small Potatoes | 13.0 |
| 4X21 | Zero Sum | 11.7 |
| 4X22 | Elegy | 10.6 |
| 4X23 | Demons | 11.8 |
| 4X24 | Gethsemane | 12.7 |
| SEASON AVERAGE | 11.9 | |
| 5X02 | Redux | 16.1 |
| 5X03 | Redux II | 15.6 |
| 5X01 | Unusual Suspects | 13.0 |
| 5X04 | Detour | 13.2 |
| 5X06 | Post-Modern Prometheus | 12.7 |
| 5X05 | Christmas Carol | 12.8 |
| 5X07 | Emily | 12.4 |
| 5X08 | Kitsunegari | 11.6 |
| 5X09 | Schizogeny | 12.9 |
| 5X10 | Chinga | 12.7 |
| 5X11 | Kill Switch | 11.1 |
| 5X12 | Bad Blood | 12.0 |
| 5X13 | Patient X | 12.6 |
| 5X14 | The Red And The Black | 12.0 |
| 5X15 | Travelers | 9.9 |
| 5X16 | Mind's Eye | 10.4 |
| 5X17 | All Souls | 8.5 |
| 5X18 | The Pine Bluff Variant | 11.4 |
| 5X19 | Folie A Deux | 11.0 |
| 5X20 | The End | 11.9 |
| SEASON AVERAGE | 12.2 | |
| 6ABX01 | The Beginning | 11.9 |
| 6ABX02 | Drive | 11.0 |
| 6ABX03 | Triangle | 10.8 |
| 6ABX04 | Dreamland | 10.1 |
| 6ABX05 | Dreamland II | 10.0 |
| 6ABX08 | How The Ghosts Stole Christmas | 10.6 |
| 6ABX06 | Terms Of Endearment | 10.5 |
| 6ABX07 | The Rain King | 12.5 |
| 6ABX10 | SR 819 | 9.1 |
| 6ABX09 | Tithonus | 9.2 |
| 6ABX11 | Two Fathers | 11.5 |
| 6ABX12 | One Son | 10.1 |
| 6ABX14 | Agua Mala | 10.1 |
| 6ABX15 | Monday | 10.2 |
| 6ABX13 | Arcadia | 10.5 |
| 6ABX16 | Alpha | 10.1 |
| 6ABX17 | Trevor | 10.4 |
| 6ABX18 | Milagro | 9.0 |
| 6ABX20 | The Unnatural | 10.1 |
| 6ABX19 | Three Of A Kind | 8.2 |
| 6ABX21 | Field Trip | 9.5 |
| 6ABX22 | Biogenesis | 9.4 |
| SEASON AVERAGE | 10.2 | |
| 7ABX03 | The Sixth Extinction | 10.6 |
| 7ABX04 | The Sixth Extinction II | 10.1 |
| 7ABX01 | Hungry | 9.6 |
| 7ABX05 | Millennium | 9.1 |
| 7ABX06 | Rush | 7.9 |
| 7ABX02 | The Goldberg Variation | 8.8 |
| 7ABX07 | Orison | 10.7 |
| 7ABX08 | The Amazing Maleeni | 10.5 |
| 7ABX09 | Signs And Wonders | 10.2 |
| 7ABX10 | Sein Und Zeit | 9.9 |
| 7ABX11 | Closure | 10.0 |
| 7ABX12 | X-Cops | 10.6 |
| 7ABX13 | First Person Shooter | 10.9 |
| 7ABX14 | Theef | 9.1 |
| 7ABX15 | En Ami | 9.3 |
| 7ABX16 | Chimera | 8.9 |
| 7ABX17 | all things | 8.9 |
| 7ABX19 | Brand X | 8.3 |
| 7ABX18 | Hollywood A.D. | 10.0 |
| 7ABX20 | Fight Club | 9.2 |
| 7ABX21 | Je Souhaite | 9.2 |
| 7ABX22 | Requiem | 10.3 |
| SEASON AVERAGE | 9.6 | |
| 8X01 | Within | 9.5 |
| 8X02 | Without | 9.0 |
| 8x04 | Patience | 8.2 |
| 8x05 | Roadrunners | 8.3 |
| 8x06 | Invocation | 8.2 |
| 8x03 | Redrum | 8.1 |
| 8X07 | Via Negativa | 7.3 |
| 8x09 | Surekill | 8.0 |
| 8x10 | Salvage | 7.1 |
| 8x12 | Badlaa | 7.3 |
| 8x11 | The Gift | 9.4 |
| 8x13 | Medusa | 8.2 |
| 8x08 | Per Manum | 9.4 |
| 8x14 | This is not Happening | 10.6 |
| 8x15 | DeadAlive | 8.6 |
| 8x17 | Empedocles | 8.2 |
| 8x18 | Three Words | 7.5 |
| 8x16 | Vienen | 8.3 |
| 8x19 | Alone | 8.2 |
| 8x20 | Essence | 9.0 |
| 8x21 | Existence | 10.2 |
| SEASON AVERAGE | 8.5 | |
| 9x01 | Nothing Important Happened Today | 7.0 |
| 9x02 | Nothing Important Happened Today II | 5.9 |
| 9x03 | Dæmonicus | 5.5 |
| 9x04 | 4-D | 5.1 |
| 9x05 | Lord of the Flies | 6.2 |
| 9x08 | Trust No1 | 5.1 |
| 9x07 | John Doe | 5.0 |
| 9x04 | Hellbound | 5.1 |
| 9x10 | Provenance | 5.5 |
| 9x11 | Providence | 5.2 |
| 9x13 | Audrey Pauley | 4.8 |
| 9x09 | Underneath | 4.4 |
| 9x14 | Improbable | 5.2 |
| 9x12 | Scary Monsters | 5.1 |
| 9x15 | Jump the Shark | 5.1 |
| 9x17 | William | 5.8 |
| 9.16 | Release | 5.1 |
| 9x18 | Sunshine Days | 6.2 |
| 9x19 9x20 |
The Truth | 7.5 |
| SEASON AVERAGE | 5.5 |