October 15, 1991: Kara-El returns from the dead, revealed to be secretly hiding on Earth following the events of Crisis On Infinite Earths and giving secret guidance and advice to the new Supergirl Linda Danvers.
April 15, 1993: Bane begins his all-out assault on Gotham through various means (initially by releasing Arkham Asylum). Bruce convinces Jason Todd to come out of retirement to help him and Tim Drake regain control of the city.
June 21, 1993: Following the Crippling of Superman story arc, Kara-El comes out of here retirement on Earth and becomes the protector of Metropolis. She takes Superboy under her wing, chairs the Justice League, and teams up with various Batmen (Bruce, Jason, Dick) before Superman regains his ability to walk a year later.
August 15, 1993: The best-selling Death of Batman story arc, with Bane snapping Batman's neck. Jason Todd hijacks some government technology, making it into a new Batman armor and using it to both cripple Bane and also claim the mantle of Batman for himself.