One of the most controversial periods of the Legion, one of the most confusing, and one that requires the most backstory.
Preludes
The Legion and “The Grid”
Invasion and the Legion
L.E.G.I.O.N. and the Legion
How the 5YL will be covered
5YL membership
1989
Legion of Super-Heroes v4 #1-3
Legion of Super-Heroes v4 #4
Secret Origins v2 #46
Secret Origins v2 #46 – Bonus
Secret Origins v2 #47
1990
Legion of Super-Heroes v4 #5-8
Secret Origins vol2 #49
Legion of Super-Heroes v4 #9-10
Intermission: Mon-El in 1990
Legion of Super-Heroes v4 #11
Legion of Super-Heroes v4 #12-15
1991
Intermission: Superman Time, Part 1 (Adventures of Superman #477)
Books of Magic #4
Legion of Super-Heroes v4 #16-18
Adventures of Superman #478
Legion of Super-Heroes v4 #19-20
Legion of Super-Heroes v4 #21-24
Intermission: Mon-El in 1991
Justice League Europe Annual #2
Legion of Super-Heroes v4 Annual #2
Legion of Super-Heroes v4 #25-27
1992
Legion of Super-Heroes v4 #28
Intermission: Mon-El in 1992
Legion of Super-Heroes v4 #29-32
Legion of Super-Heroes v4 Annual #3