| Series | | Books |
| |
| Spynosaur | | (2016) |
| | | (2017) |
| | | (2017) |
| | | (2018) |
| |
| Other | | Alien Escape! (2010) |
| | | Alien Invasion (2010) |
| | | The Beast of Grubbers Nubbin [Stitch Head] (2015) |
| | | Cosmic Calamity (2013) |
| | | The Curse of Clawfingers [Dinkin Dings] (2009) |
| | | Dinkin Dings and the Frightening Things [Dinkin Dings] (2009) |
| | | The Double from Dimension 9 [Dinkin Dings] (2012) |
| | | The Forgotten Creation [Stitch Head] (2023) |
| | | Frog the Barbarian [Legend of Frog] (2014) |
| | | The Ghost of Grotteskew [Stitch Head] (2012) |
| | | The Haunting of Luna Moon [Skeleton Keys] (2020) |
| | | The Legend of Frog [Legend of Frog] (2014) |
| | | The Legend of Gap-tooth Jack [Skeleton Keys] (2020) |
| | | The Madness of Madame Malice aka Malice's Madness [Atomic!] (2012) |
| | | The Mighty Frog [Legend of Frog] (2015) |
| | | Monster Birthday [Gormy Ruckles] (2009) |
| | | Monster Boy [Gormy Ruckles] (2008) |
| | | Monster Contest [Gormy Ruckles] (2009) |
| | | Monster Hero [Gormy Ruckles] (2009) |
| | | Monster Hero [Gormy Ruckles] (2009) |
| | | Monster Hero [Gormy Ruckles] (2009) |
| | | The Monster Hunter [Stitch Head] (2016) |
| | | Monster Mischief [Gormy Ruckles] (2008) |
| | | Monster Trouble [Gormy Ruckles] (2009) |
| | | The Night of the Nobody [Skeleton Keys] (2021) |
| | | The Pirate's Eye [Stitch Head] (2012) |
| | | The Revenge of the Fish-Men [Dinkin Dings] (2009) |
| | | Secret Santa (2010) |
| | | The Spider's Lair [Stitch Head] (2013) |
| | | Stitch Head [Stitch Head] (2011) |
| | | Unimaginary Friend [Skeleton Keys] (2019) |
| | | The Vengeance of Vinister Vile aka Vile's Vengeance [Atomic!] (2012) |
| | | The Wild Imaginings of Stanley Strange [Skeleton Keys] (2021) |
| |