The X-COM Series

1947-1999	👽 Prelude
1999-2002	👽 The First Alien War
	1999 🎮 X-COM: Enemy Unknown/UFO Defense
	1999 🎮 X-COM: Enforcer
2002-2040	👽 Interlude
2041-2046	👽 The Second Alien War
	2041 🎮 X-COM: Terror From The Deep
2046-2065	👽 Recovery
	2062 🎮 X-COM: Alliance (cancelled)
2065-2067	👽 The Frontier
	2067 🎮 X-COM: Interceptor (Hypernews Network, Research)
2084-2085	👽 The Mega-Primus War
	2084 🎮 X-COM: Apocalypse
	2085 🎮 X-COM: Genesis (cancelled - also linked to the Recovery period with Alliance as technology in the games was similar)

Material Sources