Novels

• The Pirate Paradox (1991), ISBN 0-06-106016-X, (with Nick Baron).
• Deep Space Nine: Devil in the Sky (1995), ISBN 0-671-88114-0, with John Gregory Betancourt
• The Next Generation: Dragon's Honor (1996), ISBN 0-671-50107-0, with Kij Johnson
• Voyager: The Black Shore (1997), ISBN 0-671-56061-1
• Star Trek: Assignment: Eternity (1997), ISBN 0-671-00117-5
• The Next Generation: The Q Continuum:
1. Q-Space (1998), ISBN 0-671-01915-5
2. Q-Zone (1998), ISBN 0-671-01921-X
3. Q-Strike (1998), ISBN 0-671-01922-8
• Roswell: Loose Ends (2001), ISBN 0-7434-1834-4
• Star Trek: The Rise and Fall of Khan Noonien Singh
• Volume 1 (2001), ISBN 0-671-02127-3
• Volume 2 (2002), ISBN 0-7434-0643-5
• Daredevil (2003), ISBN 0-451-41080-7 (novelization)
• Underworld:
1. Underworld (2003), ISBN 0-7434-8071-6 (novelization)
2. Blood Enemy (2004), ISBN 0-7434-8072-4
3. Evolution (2005), ISBN 0-7434-8073-2 (novelization)
4. Rise of the Lycans (2009), ISBN 1-4391-1284-3 (novelization)

• Star Trek: The Exile of Khan Noonien Singh (2005), ISBN 0-7434-5711-0
• Fantastic Four: War Zone (2005), ISBN 1-4165-0965-8
• Alias: Two of a Kind? (2005), ISBN 1-4169-0213-9
• Alias: The Road Not Taken (2005), ISBN 1-4169-0248-1
• Infinite Crisis (2006), ISBN 0-441-01444-5
• Iron Man: The Armor Trap (1995) ISBN 1-5729-7008-1
• Iron Man: Operation A.I.M. (1996) ISBN 1-5729-7195-9
• 52 (2007) ISBN 0-4410-1507-7
• Countdown (2009) ISBN 0-4410-1718-5
• The 4400
• The Vesuvius Prophecy (2008), ISBN 1-4165-4317-1
• Welcome to Promise City (2009), ISBN 1-4165-4322-8
• Terminator Salvation: Cold War (2009), ISBN 1-8485-6087-7

Short fiction

• "The Weeping Woman", Tales of Zorro edited by Richard Dean Starr, Moonstone Books (2008), ISBN 978-1-933076-31-7

Non-fiction

• The Transylvanian Library: A Consumer's Guide to Vampire Fiction, Borgo Press, 1991