JLA #1000000 (Cvr A) (1998)

One Million - Prisoners of the Twentieth Century
The future JLA can see only one way to save the world of the 20th century, and they'll need present JLA hardware to do it. Lacking the time to explain themselves, their virus-increased aggression kicks in and they simply invade. Steel manages to retain enough clear thought process to defuse the situation.
Release Date: 1998