All-Star Squadron (1981-1987) #14

Per Degaton has once again regained his memories in 1947, and decides this time he will not fail to conquer Earth-2 in the past by going to 1942 this time (having been defeated on Dec. 7, 1941 last time by the All-Stars and JSA). His use the Crime Syndicate to steal nuclear weapons from Earth Prime circa 1962 from Cuba during the Cuban Missile Crisis (which in turn caused that world to have a nuclear war) to use for his purposes. Meanwhile, the All-Stars meet up with the JLA and JSA and learn of Earth Prime's fate in 1962 from them, and pledge to help out.