Cerebus Jam was one of Dave's side projects (1985). He invited colleagues to
contribute stories and art to a Cerebus reader. He intended to make an
irregular series of it, but unfortunately nothing beyond the first ever
appeared.
The cover looks very Sienkiewicz, but he is never mentioned in the credits. Is
it a Sim/Gerhard masterpiece of imitation, or did Bill want to remain
unmentioned for legal reasons?