▁rejected ▁by ▁DC ▁Comics ), ▁took ▁their ▁ideas ▁to ▁Dark ▁Hor se , ▁for ▁whom ▁Adams ▁had ▁already ▁done ▁work , ▁as ▁it ▁would ▁allow ▁them ▁to ▁collabor ate ▁with ▁cre ators ▁they ▁adm ired , ▁such ▁as ▁Frank ▁Miller ▁and ▁John ▁By r ne . ▁T ogether ▁with ▁Paul ▁Ch ad wick , ▁Mike ▁All red , ▁Dave ▁Gib b ons , ▁and ▁Ge of ▁D arrow , ▁the ▁cre ators ▁formed ▁Leg end , ▁a ▁cre ator - owned ▁im print ▁of ▁Dark ▁Hor se . ▁After ▁an ▁initial ▁ 1 9 9 3 ▁appearance ▁in ▁San ▁Diego ▁Com ic ▁Con ▁Comics ▁# 2 , ▁Mon ke yman ▁and ▁O ' B rien ▁appeared ▁in ▁install ments ▁in ▁Dark ▁Hor se ▁Pres ents ▁# 8 0 ▁in ▁ 1 9 9 3 ▁and ▁Dark ▁Hor se ▁Ins ider ▁# 2 7 ▁in ▁ 1 9 9 4 . ▁The ▁du o ' s ▁first ▁appearance ▁under ▁the ▁Leg end ▁im print ▁was ▁an ▁on going ▁backup ▁story ▁in ▁Mike ▁M ign ola ' s ▁ 1 9 9 4 ▁Hell boy : ▁Se ed ▁of ▁Dest ruction ▁min is eries . ▁They ▁would ▁eventually ▁gradu ate ▁to ▁their ▁own ▁self - t itled ▁min is eries ▁in ▁ 1 9 9 6 . ▁When ▁first ▁producing ▁the ▁series , ▁Adams ▁had ▁on ▁hand ▁the ▁Marvel ▁Mon ster works ▁repr int ▁of ▁the ▁Atlas ▁Comics ▁mon ster ▁stories ▁" Where ▁Mon sters ▁D well " ▁and ▁" Cre atures ▁on ▁the ▁Lo