Action Comics #693 1993

Action Comics #693 features Superman discovering his Fortress of Solitude destroyed, a consequence of the Eradicator draining its power to restore itself after a battle with Cyborg Superman. A dying Dr. David Connor then accidentally merges his mind with the Eradicator, creating a new, more aggressive version of the character. This issue is notable for the pivotal transformation of Dr. Connor into the new Eradicator and the destruction of Superman's iconic fortress, marking a key moment in the aftermath of the 'Reign of the Supermen' saga.