Star Trek
- Star Trek: The Original Series
- #45. Double, Double (1989)
- #56. Legacy (1991)
- #58. Faces of Fire (1992)
- #85. Republic: My Brother's Keeper 1 (1998)
- #86. Constitution: My Brother's Keeper 2 (1998)
- #87. Enterprise: My Brother's Keeper 3 (1998)
- Star Trek Federation Guide (1997)
- Star Trek: The Next Generation
- #9. A Call to Darkness (1989)
- #12. Doomsday World (1990) (with Carmen Carter, Peter David and Robert Greenberger)
- #15. Fortune's Light (1990)
- #32. Requiem (1994) (with Kevin Ryan)
- #56. The First Virtue: Double Helix 6 (1999) (with Christie Golden)
- Reunion (1991)
- Relics (1992)
- All Good Things... (1994)
- Crossover (1995)
- Kahless (1996)
- Planet X (1998)
- Q's Guide to the Continuum (1998) (with Robert Greenberger)
- The Valiant (2000)
- Double Helix Omnibus (2002) (with John Gregory Betancourt, Diane Carey, Peter David, Christie Golden, Kristine Kathryn Rusch, Dean Wesley Smith and John Vornholt)
- Pantheon (2003)
- The Hand of Kahless (2004) (with John M. Ford)
- Death in Winter (2005)
- Star Trek: Miscellaneous
- The Modala Imperative (1992)
- Shadows on the Sun (1993)
- Starfleet Year One (2001)
- Star Trek: Starfleet Academy
- #6. Mystery of the Missing Crew (1994)
- #7. Secret of the Lizard People (1995)
- Star Trek: Deep Space Nine
- Star Trek: Day of Honor
- #3. Her Klingon Soul (1997)
- Star Trek Day of Honor (1997) (with Diane Carey, L.A. Graf, Kristine Kathryn Rusch and Dean Wesley Smith)
- Star Trek: Captain's Table
- #2. Dujonian's Hoard (1998)
- Stargazer
- Gauntlet (2002)
- Progenitor (2002)
- Stargazer: Three (2003)
- Oblivion (2003)
- Enigma (2003)
- Maker (2004)
Star Wars
The New Jedi Order Series
Jedi Storm (this book was completed as the first in a 3-part series, which was cancelled).
Other Novels
- Batman and Robin Novelization (1997)
- Fantastic Four
- Redemption of the Silver Surfer (1998)
- The Glove of Maiden's Hair (1987)
- The New Adventures of Superman
- Heat Wave (1996)
- Deadly Games (1996)
- Lara Croft: Tomb Raider
- Tomb Raider Tech Manual (2001)
- Vidar
- The Hammer and the Horn (1985)
- The Seekers and the Sword (1985)
- The Fortress and the Fire (1988)
- Wishbone
- #5. Hunchdog of Notre Dame (1997)
- The Mutt in the Iron Muzzle (1997)
- Wishbone Mysteries
- #5. The Stolen Trophy (1998)
- #16. The Sirian Conspiracy (2000)
- X-Men
- Shadows of the Past (2000)
- The Chaos Engine Book 1: X-Men / Doctor Doom (2000)