NY: Random House, (1996.) dj. Hardcover first edition - Novel based on a series of trading cards issued by Topps in 1962, which were considered too gruesome and were quickly withdrawn, until 1995 when they were re-issued. Two trading cards on stiff glossy stock bound in. ISBN: 0-345-404963.

New York: Ace Books, (2012) dj. SIGNED hardcover first edition - The authors' second collaboration. . When two teams of astronauts are sent to explore an asteroid, they discover that it is actually a giant spacecraft with an alien crew. SIGNED on the title page by Michael Cassutt. 431 pp. ISBN: 978-0441020928.

New York: Ace Books, (2012) dj. Hardcover first edition - The authors' first collaboration. ."A vastly more intelligent species is desperately attempting to communicate" with us. 398 pp. ISBN: 978-0441020331.

New York: Ballantine, (1991) dj. Hardcover first edition - The publisher describes this as "a classic SF yarn in the old style of bad guy aliens vs. good guy aliens, with humans holding a special place between them. The twist is that the special human qualities the aliens value are just the same qualities we abhor in ourselves. So while you enjoy the classic battles across the galaxy and interspecies intrigue, you have a very contemporary and critical view of humanity." 641 pp. ISBN: 0-345358554.

New York: Bantam, (2001) dj. Hardcover first edition - A mix of suspense and horror, as a young woman attempts to save a handicapped girl from her stepfather who claims to have had a vision that by her 10th birthday aliens will either heal her or take her away to a better world. 606 pp. ISBN: 0-553801376.

New York: Bantam, (2001) dj. SIGNED hardcover first edition - A mix of suspense and horror, as a young woman attempts to save a handicapped girl from her stepfather who claims to have had a vision that by her 10th birthday aliens will either heal her or take her away to a better world. INSCRIBED "Open it!" and dated by Koontz on the half title page. 606 pp. ISBN: 0-553801376.

NY: Random House, (1996.) dj. Hardcover first edition - Novel based on a series of trading cards issued by Topps in 1962, which were considered too gruesome and were quickly withdrawn, until 1995 when they were re-issued. Two trading cards on stiff glossy stock bound in. ISBN: 0-345-404963.

Los Angeles: Hyperion, (2007) dj. SIGNED hardcover first edition - An "imaginative, wacky, hilarious sci-fi story" written and illustrated by Rex, his first book about Smek. The NY Times commented that, while it was written for children, adults will appreciate it as a satire about the conquering of foreign cultures. SIGNED on the dedication page with a small drawing. (Jennifer Lopez is one of the dedicatees and J.Lo is the name of a renegade Boov mechanic in this tale) 423 pp plus an epilogue and a final drawing. ISBN: 978-0786849000.