| 1. Answers Given to Questions Never Asked |
S04E01 / Air Date: 29 September 2003 |
| 2. Pieces of Eight |
S04E02 / Air Date: 06 October 2003 |
| 3. Waking the Tyrant's Device |
S04E03 / Air Date: 13 October 2003 |
| 4. Double or Nothingness |
S04E04 / Air Date: 20 October 2003 |
| 5. Harper/Delete |
S04E05 / Air Date: 27 October 2003 |
| 6. Soon the Nearing Vortex |
S04E06 / Air Date: 03 November 2003 |
| 7. The World Turns All Around Her |
S04E07 / Air Date: 10 November 2003 |
| 8. Conduit to Destiny |
S04E08 / Air Date: 17 November 2003 |
| 9. Machinery of the Mind |
S04E09 / Air Date: 12 January 2004 |
| 10. Exalted Reason, Resplendent Daughter |
S04E10 / Air Date: 19 January 2004 |
| 11. The Torment, the Release |
S04E11 / Air Date: 26 January 2004 |
| 12. The Spider's Stratagem |
S04E12 / Air Date: 02 February 2004 |
| 13. The Warmth of an Invisible Light |
S04E13 / Air Date: 09 February 2004 |
| 14. The Others |
S04E14 / Air Date: 16 February 2004 |
| 15. Fear Burns Down to Ashes |
S04E15 / Air Date: 23 February 2004 |
| 16. Lost in a Space That Isn't There |
S04E16 / Air Date: 05 April 2004 |
| 17. Abridging the Devil's Divide |
S04E17 / Air Date: 12 April 2004 |
| 18. Trusting the Gordian Maze |
S04E18 / Air Date: 19 April 2004 |
| 19. A Symmetry of Imperfection |
S04E19 / Air Date: 26 April 2004 |
| 20. Time Out of Mind |
S04E20 / Air Date: 03 May 2004 |
| 21. The Dissonant Interval: Part 1 |
S04E21 / Air Date: 10 May 2004 |
| 22. The Dissonant Interval: Part 2 |
S04E22 / Air Date: 17 May 2004 |
