4 - 1Criminal Nature Jan. 23, 1998- 4 - 2The Hunt Jan. 30, 1998
- 4 - 3Hearts and Minds Feb. 06, 1998
- 4 - 4In Another Life Feb. 16, 1998
- 4 - 5In the Zone Feb. 20, 1998
- 4 - 6Relativity Theory Feb. 27, 1998
- 4 - 7Josh Mar. 06, 1998
- 4 - 8Rite of Passage Mar. 13, 1998
4 - 9Glyphic Mar. 20, 1998- 4 - 10Identity Crisis Mar. 27, 1998
- 4 - 11The Vaccine Apr. 03, 1998
- 4 - 12Fear Itself Apr. 10, 1998
- 4 - 13The Joining Apr. 17, 1998
- 4 - 14To Tell the Truth Apr. 24, 1998
4 - 15Mary 25 May. 29, 1998- 4 - 16Final Exam Jun. 05, 1998
- 4 - 17Lithia Jul. 03, 1998
- 4 - 18Monster Jul. 10, 1998
- 4 - 19Sarcophagus Aug. 07, 1998
- 4 - 20Nightmare Aug. 14, 1998
- 4 - 21Promised Land Aug. 21, 1998
- 4 - 22The Balance of Nature Sep. 04, 1998
- 4 - 23The Origin of Species Nov. 27, 1998
- 4 - 24Phobos Rising Dec. 04, 1998
4 - 25Black Box Dec. 11, 1998
4 - 26In Our Own Image Dec. 18, 1998
