Cerebus did not only appear in the main story. On numerous
occasions he was the hero of backup stories, or decorated the
covers of other publications. Many of these spin-offs are
collected in the crossover volume; the classification is a bit
arbitrary.
In here, you find three sections:
Story single panes from full stories, some part
of the main thread, some standalone tales. They appeared in
Swords of Cerebus and a few other comics.
Art a few isolated pictures that don't belong to
a story.
Cover since not only the regular series features
beautiful covers. There are also several other comic sleeves with
full colour artwork.