4 books in series

Invasion

Invasion is a 4-book series with 4 released primary works first released in 1975 with contributions by D.I. Freed and D.C. Alden.

#1
Activation

#1 of 4 in Invasion

2003 • 5 Readers • 543 pages • 3.5

#2
Assault

#2 of 4 in Invasion

2004 • 3 Readers • 860 pages • 5

#3
Invasion: Frontline

#3 of 4 in Invasion

2004 • 2 Readers • 797 pages

#4
Invasion: Deliverance

#4 of 4 in Invasion

1975 • 2 Readers • 478 pages