Invasion! was DC’s big crossover event for 1989. It crossed over into 30 other DC comics and also featured guest appearances from other DC Universe staples such as Adam Strange, the planet Thanagar, and one-time Justice League of America sidekick Snapper Carr and his team the Blasters. The Blasters would make several more appearances, fighting further alien threats to Earth.
The greatest impact of Invasion was its introduction of the metagene as the explanation within the DC Universe as to how some people gain superhuman abilities. The Flash’s father, Rudolph West (a Manhunter agent) appears to die in an explosion in Cuba, defending the land during Invasion #2. His subsequent returns would plague the Flash and his mother multiple times. Unusual for the time, the three issues were published as perfect-bound comics, each the length of three usual comics – a throwback to the “80-page giants” of the Silver Age.