"Skullduggery"
Triangle 1991-34. Continued from Adventures of Superman (1987) #483 and continues in Superman: The Man of Steel #5.
As the finale of Armageddon 2001 destroys the Metropolis S.T.A.R. Labs, a new menace is created -- The Atomic Skull! Continued from Armageddon 2001 #2.
First appearance (post-CoIE) of the Atomic Skull.