Event

Crisis on Multiple Earths
What Happened
Before the Crisis on Infinite Earths, the Justice League of America from Earth-1 and the Justice Society of America from Earth-2 would periodically join forces to stop menaces to both of their universes.
Notable Deaths, Destruction or Introduction

Death

Spectre I

Introduction

Anti-Matter Man

Crime Syndicate

Freedom Fighters

Lawless League

Red Tornado II
Creators

Writers

Dennis O’Neil

Gardner Fox

Artists

Dick Dillin

Joe Giella

Mike Sekowsky

Sid Greene
Pertinent Issues & Crossovers
Justice League of America Vol. 1 #21 (Aug. 1962)

Justice League of America Vol. 1 #22  (Sept. 1962)

Justice League of America Vol. 1 #29 (Aug. 1964)

Justice League of America Vol. 1 #30 (Sept. 1964)

Justice League of America Vol. 1 #37 (Aug. 1965)

Justice League of America Vol. 1 #38 (Sept. 1965)

Justice League of America Vol. 1 #46 (Aug. 1966)

Justice League of America Vol. 1 #47 (Sept. 1966)

Justice League of America Vol. 1 #55 (Aug. 1967)

Justice League of America Vol. 1 #56 (Sept. 1967)

Justice League of America Vol. 1 #64 (Aug. 1968)

Justice League of America Vol. 1 #65 (Sept. 1968)

Justice League of America Vol. 1 #73 (Aug. 1969)

Justice League of America Vol. 1 #74 (Sept. 1969)

Justice League of America Vol. 1 #83 (Aug. 1970)

Justice League of America Vol. 1 #84 (Sept. 1970)

Justice League of America Vol. 1 #91 (Aug. 1971)

Justice League of America Vol. 1 #92 (Sept. 1971)

Justice League of America Vol. 1 #100 (Aug. 1972)

Justice League of America Vol. 1 #101 (Sept. 1972)

Justice League of America Vol. 1 #102 (Oct. 1972)

Justice League of America Vol. 1 #107 (Oct. 1973)

Justice League of America Vol. 1 #108 (Nov. 1973)

Justice League of America Vol. 1 #113 (Oct. 1974)

Justice League of America Vol. 1 #114 (Dec. 1974)

Justice League of America Vol. 1 #123 (Oct. 1975)

Justice League of America Vol. 1 #124 (Nov. 1975)

Justice League of America Vol. 1 #135 (Oct. 1976)

Justice League of America Vol. 1 #136 (Nov. 1976)

Justice League of America Vol. 1 #147 (Oct. 1977)

Justice League of America Vol. 1 #148 (Nov. 1977)

Justice League of America Vol. 1 #159 (Oct. 1978)

Justice League of America Vol. 1 #160 (Nov. 1978)

Justice League of America Vol. 1 #171 (Oct. 1979)

Justice League of America Vol. 1 #172 (Nov. 1979)

Justice League of America Vol. 1 #183 (Oct. 1980)

Justice League of America Vol. 1 #184 (Nov. 1980)

Justice League of America Vol. 1 #185 (Dec. 1980)

Justice League of America Vol. 1 #195 (Oct. 1981)

Justice League of America Vol. 1 #196 (Nov. 1981)

Justice League of America Vol. 1 #197 (Dec. 1981)

Justice League of America Vol. 1 #207 (Oct. 1982)

Justice League of America Vol. 1 #208 (Nov. 1982)

Justice League of America Vol. 1 #209 (Dec. 1982)

Justice League of America Vol. 1 #219 (Oct. 1983)

Justice League of America Vol. 1 #220 (Nov. 1983)

Justice League of America Vol. 1 #231 (Oct. 1984)

Justice League of America Vol. 1 #232 (Nov. 1984)

Justice League of America Vol. 1 #244 (Nov. 1985)

Justice League of America Vol. 1 #245 (Dec. 1985)