Superman: Exile
For me, Superman RULED throughout the early '90's, and it's a real shame that nowerdays the comic is so unashamedly shite. For those without the knowledge, Exile takes place right after a story where Superman literally executed three Kryptonians from another dimension after, in that other dimension, the three committed mass genocide on planet Earth. Feeling guilty, Superman decided to leave his (unharmed) Earth and set out for the stars with the help of a distance transporter and oxygen machine. Basically, this long story was the genesis of various characters and stories including Mongul and the Eradicater. As well as being morally interesting and character developing, it was drawn well and extremely well written.