Raven League (With Alex Simmons)

McCay co-wrote two novels in the Raven League series with Alex Simmons: ^{[2] [3]}

• Buffalo Bill Wanted! (2006)
• Sherlock Holmes Is Missing! (2007)

Mage Knight

McCay contributed the first novel in the Mage Knight wargaming tie-in:

• Rebel Thunder (2003)

Tom Clancy's Net Force Explorers

McCay contributed several novels in the Tom Clancy's Net Force Explorers series:

• Cyberspy (1999) with Tom Clancy and Steve R. Pieczenik
• The Great Race (1999)
• Private Lives (2000)
• Duel Identity (2000)
• Cold Case (2001)

Nintendo Adventure Books

McCay contributed two books to the Nintendo Adventure Books series:

• Monster Mix-Up (1991)
• Koopa Capers (1991)

Stan Lee's Riftworld

• Crossover (1993) ^[4]
• Villains (1994)
• Odyssey (1996) with Stan Lee

Star Trek Universe

• Chains of Command (1992) with Eloise Flood ^[5]

Stargate

Extended novelization of the original film, based on Roland Emmerich's backstory notes.

• Rebellion (1995)
• Retaliation (1996)
• Retribution (1997)
• Reconnaissance (1998)
• Resistance (1999)

Tom Swift

McCay contributed two books to the Tom Swift series, writing under the house pseudonym Victor Appleton.

• The Black Dragon (1991) [as by Victor Appleton]
• The Negative Zone (1991) [as by Victor Appleton]