Katherine 'Kitty' Katt

1 Touched By an Alien (2010)
2 Alien Tango (2010)
3 Alien in the Family (2011)
4 Alien Proliferation (2011)
5 Alien Diplomacy (2012)
6 Alien vs Alien (2012)
7 Alien in the House (2013)
8 Alien Research (2013)
9 Alien Collective (2014)
10 Universal Alien (2014)
11 Alien Separation (2015)
12 Alien in Chief (2015)
13 Camp Alien (2016)
14 Alien Nation (2016)
15 Alien Education (2017)
16 Aliens Abroad (2018)
17 Aliens Like Us (2024)
18 Aliens Like Them (2026)

The Alien Collection: The First Companion to the Alien/Katherine (2025)